Updates here usually drop around 10 am But something like this could be anytime really. It will roll out in batches, so some phones will get the update before others
The uk is apart of today's realise so far I haven't got it for my s24 ultra but so many other people haven't either but also you're phone might not get the update today just keep checking you're software update over couple hours and next week or so it'll pop up at some point.
