We'll want the all-clear from Sydney before we enable this on all wiki. Probably targeting mid/late May.
Revert T192962: Disable Datetime Selector on Special:Block on all wikis except Meta, MediaWiki, and German Wikipedia so all wikis can have T132220: Add datetime selector to Special:Block to select expiration
We'll also want to complete T190762: Announce to wikis before releasing DateTime selector on Special:Block first