The first Galaxy S20 units are already receiving the July security patch in Korea, but in the US, the slow carrier rollout of the June update continues to arrive on many people's phones. S10 and Note10 owners on Verizon and Note9 users on T-Mobile can look forward to the patch, which is only now starting to roll out to them. Along with the security enhancements, the phones are getting smaller system and performance improvements.
Samsung Galaxy S20 update on T-Mobile. Source: TmoNews.
With T-Mobile and Verizon rolling out these updates, that leaves us with the following picture regarding the June update availability across US carriers (new entries marked bold):
Galaxy S20 series
Galaxy S20: Version G981USQU1ATF9, rolling out since June 22.
Galaxy S20+: Version G986USQU1ATF9, rolling out since June 22.