Here's a Python script using the Github API. I wanted to include the date and last commit message. You'll need to include a Personal Access Token (PAT) if you need a bump to 5k requests/hr.

USAGE: python3 list-forks.py https://github.com/itinance/react-native-fs

Example Output:

https://github.com/itinance/react-native-fs root 2021-11-04 "Merge pull request #1016 from mjgallag/make-react-native-windows-peer-dependency-optional  make react-native-windows peer dependency optional"
https://github.com/AnimoApps/react-native-fs diverged +2 -160 [+1m 10d] "Improved comments to align with new PNG support in copyAssetsFileIOS"
https://github.com/twinedo/react-native-fs ahead +1 [+26d] "clear warn yellow new NativeEventEmitter()"
https://github.com/synonymdev/react-native-fs ahead +2 [+23d] "Merge pull request #1 from synonymdev/event-emitter-fix  Event Emitter Fix"
https://github.com/kongyes/react-native-fs ahead +2 [+10d] "aa"
https://github.com/kamiky/react-native-fs diverged +1 -2 [-6d] "add copyCurrentAssetsVideoIOS function to retrieve current modified videos"
https://github.com/nikola166/react-native-fs diverged +1 -2 [-7d] "version"
https://github.com/morph3ux/react-native-fs diverged +1 -4 [-30d] "Update package.json"
https://github.com/broganm/react-native-fs diverged +2 -4 [-1m 7d] "Update RNFSManager.m"
https://github.com/k1mmm/react-native-fs diverged +1 -4 [-1m 14d] "Invalidate upload session  Prevent memory leaks"
https://github.com/TickKleiner/react-native-fs diverged +1 -4 [-1m 24d] "addListener and removeListeners methods wass added to pass warning"
https://github.com/nerdyfactory/react-native-fs diverged +1 -8 [-2m 14d] "fix: applying change from https://github.com/itinance/react-native-fs/pull/944"

import requests, re, os, sys, time, json, datetime
from dateutil.relativedelta import relativedelta
from urllib.parse import urlparse

GITHUB_PAT = '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'

def json_from_url(url):
    response = requests.get(url, headers={ 'Authorization': 'token {}'.format(GITHUB_PAT) })
    return response.json()

def date_delta_to_text(date1, date2):
    ret = []
    date_delta = relativedelta(date2, date1)
    sign = '+' if date1 < date2 else '-'

    if date_delta.years != 0:
        ret.append('{}y'.format(abs(date_delta.years)))

    if date_delta.months != 0:
        ret.append('{}m'.format(abs(date_delta.months)))

    if date_delta.days != 0:
        ret.append('{}d'.format(abs(date_delta.days)))

    return '{}{}'.format(sign, ' '.join(ret))

def iso8601_date_to_date(date):
    return datetime.datetime.strptime(date, '%Y-%m-%dT%H:%M:%SZ')

def date_to_text(date):
    return date.strftime('%Y-%m-%d')

def process_repo(repo_author, repo_name, fork_of_fork):
    page = 1

    while 1:
        forks_url = 'https://api.github.com/repos/{}/{}/forks?per_page=100&page={}'.format(repo_author, repo_name, page)
        forks_json = json_from_url(forks_url)

        if not forks_json:
            break

        for fork_info in forks_json:
            fork_author = fork_info['owner']['login']
            fork_name = fork_info['name']
            forks_count = fork_info['forks_count']
            fork_url = 'https://github.com/{}/{}'.format(fork_author, fork_name)

            compare_url = 'https://api.github.com/repos/{}/{}/compare/master...{}:master'.format(repo_author, fork_name, fork_author)
            compare_json = json_from_url(compare_url)

            if 'status' in compare_json:
                items = []

                status = compare_json['status']
                ahead_by = compare_json['ahead_by']
                behind_by = compare_json['behind_by']
                total_commits = compare_json['total_commits']
                commits = compare_json['commits']

                if fork_of_fork:
                    items.append('   ')

                items.append(fork_url)
                items.append(status)

                if ahead_by != 0:
                    items.append('+{}'.format(ahead_by))

                if behind_by != 0:
                    items.append('-{}'.format(behind_by))

                if total_commits > 0:
                    last_commit = commits[total_commits-1];
                    commit = last_commit['commit']
                    author = commit['author']
                    date = iso8601_date_to_date(author['date'])
                    items.append('[{}]'.format(date_delta_to_text(root_date, date)))
                    items.append('"{}"'.format(commit['message'].replace('\n', ' ')))

                if ahead_by > 0:
                    print(' '.join(items))

            if forks_count > 0:
                process_repo(fork_author, fork_name, True)

        page += 1

url_parsed = urlparse(sys.argv[1].strip())
path_array = url_parsed.path.split('/')
root_author = path_array[1]
root_name = path_array[2]

root_url = 'https://github.com/{}/{}'.format(root_author, root_name)
commits_url = 'https://api.github.com/repos/{}/{}/commits/master'.format(root_author, root_name)
commits_json = json_from_url(commits_url)
commit = commits_json['commit']
author = commit['author']
root_date = iso8601_date_to_date(author['date'])
print('{} root {} "{}"'.format(root_url, date_to_text(root_date), commit['message'].replace('\n', ' ')));

process_repo(root_author, root_name, False)