Nextcloud 20 requirements

I’m running Nextcloud 19.0.6 Stable with

Ubuntu 18.04
PHP 7.4.13
mysql 5.7.32

and get no proposal to update to Nextcloud 20.

The system requirements for Nextcloud 20 say
"Operating System Ubuntu 20.04 LTS (recommended)

Does anybody know if Ubuntu 20.04 is not just “recommended” but required?

Most critical is normally the php version, but 7.4 should be ok:

So it is just recommended not required. Normally they said the new version is rolled out, so perhaps check again.