That is too bad, I too would be very eager to see natively supported in Postgres. It doesn't seem like it should be so complex to implement on top of pg's existing uuid support, but famous last words?
It looks like the feature had made good progress with the contention really being around the fact that the standard hadn't yet become an RFC. However, the new UUID standard did reach that milestone back in early May, but the feature kinda went radio silent... at least insofar as any public record... up to a couple days ago when the assigned reviewer/committer was removed.
But no word on if it's delayed, or there's some problem, etc. It's still tagged as 17... and some of the related work has been committed, but not the UUIDv7 itself so it seems.