Hey there and welcome to the Samsung UK and EU Community Customer to Customer Forum
Not sure what is confusing.
Samsung were very clear that the Global rollout would COMMENCE on 7th April and that is exactly what has happened.
There are 10's of millions of devices to be updated and this takes time.
S24 series along with Fold 6 and Flip 6 are underway, some S23 series users now reporting receiving the update.
If your device was bought from a carrier, that carrier also needs to test and approve the update so that may slow the release down although I'm reading that some EE and Vodafone customers also now receiving it.
Just be patient
S24 Ultra