One UI6 is currently still in beta testing for S23 series, Flip 5 and Fold 5 Series respectively.
Some users believe that the stable version may be released next week but as there are ongoing issues within beta, Samsung have not yet confirmed a release date.
It is expected to be imminent however.
I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.