Shortly after the Samsung Galaxy S20 series began receiving the July security fix in Korea and Europe, the first models unlocked in the US are now also in treatment. In addition to the usual security enhancements, the update should also bring zoom and video stabilization enhancements for the camera, though this is not explicitly mentioned in the swap chart for American phones.samsung
Some Redditori with unlocked Samsung Galaxy S20 phones report that they are already receiving the July update. Unlike the Korean and European changes, the American does not mention any improvements to the camera. This may not have been mentioned, but since the US S20 version runs on different silicon, it may not have improved. However, the update weighs about 220MB on the S20 Ultra and comes as version G988U1UES1ATFB, G988U1OYM1ATFB, or G988U1UES1ATFB, depending on the version of your phone.
To check if the update is also available to you, go to Settings -> Software Update, although, as always, it is a step-by-step version and we all know that operators take a long time to click on the latest versions.