This question has been answered multiple times in the forum.
There is no definitive timetable released by Samsung. Currently S22 and S23 Series are rolling out. S21 Series won't be far away but we are not told in advance in here.
The Galaxy S21 series seems to have started getting the stable Android 14 (One UI 6.0) update for the global models. Over the past couple of months, the devices in the Galaxy S21 series have been getting One UI 6.0 beta updates, and now the stable version of the software has been released.