Hey there and welcome to the Samsung UK Community Forum
Did you do a search on your question before posting? This has been answered multiple times in the last few days
One UI6.1.1 is for FOLDABLES ONLY.
One UI6.1 (based / modelled on 6 1.1) is being rolled out to S24 Series and S23 Series with many users already having received it. BUT it has been PAUSED pending a fix for some issues.
S24 Ultra