Earlier this month Joomla 4 Release Candidate was made available, and Release Candidate 2 came out last week. With a fortnightly release schedule for updated RC releases, Joomla 4 is fast approaching the stable release, and you can get involved in the final stages.
Read more https://magazine.joomla.org/all-issues/june-2021/joomla-4-is-on-the-horizon-the-release-candidate