Mark Wilson said more than once today that the corners are 4 1/2". But I'm not sure whether he really measured them. In this event in 2021 and 2022, they were said to be 4 1/2", then 4 1/4" in 2023 and 2024. So I'll second your request for someone who knows what he or she is doing to go and measure them.What kind of table are they playing on?
And can somebody go and measure the pockets, both corner and side?
And please don't say they look 4.5" to me. Somebody go and measure them. Using two balls would be fine.