Hi mate,
Everybody in the UK with unlocked S24 series got One UI 7 on 10th April, 25. If you still haven't got it as on 6th of May, there's a problem because at this point, even S23 series has got them all updates.
You can check what firmware CSC is your device on, and if its not EUX, EVR, that's probably the reason.
Goto settings > about > software info > service provider software information, it should look like [SAxx_SM-S918B_OXM_EUX_15_xxxx EUX/-/EUX/EUX]
This example is based on a UK version.