S21 devices on the U.K. carrier branded firmware for Vodafone on CSC code VOD are now receiving the July update for AUG4.
This only leaves the carrier branded S21 devices for Three network, CSC H3G, to release. Last as usual.
It is a FOTA, (Firmware Over The Air), update and you can check... Settings > Software update... to see if it is available for you. Alternatively, you can connect to the Samsung PC suite, Smart Switch and check via that.