It was released for some in UK on 20th of this month and there was a postponed by bugs and now it depends on your network provider my s24 ultra on EE got it on 20th this month like majority of people, but then it was postponed due to reasons mentioned.
Rest assured you should get it soon got my second update wirh fixes few days ago, so it's matter of time when you will get the update.
I received mine on the 10th ee uk, s24 ultra, received a stability update on the 24th. I didn't notice any issues, all the testing they did it is worth it but I fear for the s22 and s21.