The software versions are G981U1UEU1ATCH, G986U1UEU1ATCH, and G988U1UEU1ATCH for the Galaxy S20, S20+, and S20 Ultra respectively. It comes with the March 2020 security patch. The size of this update is more than 400MB.
Samsung recently rolled out a similar software update for the Exynos International variant, which reportedly included a new version of Samsung’s Camera app — 10.0.01.98 — which apparently addresses autofocus issues. That update successfully fixed the camera autofocus issue.
If you want to check for the update manually, just head into the device Settings, tap on the Software update menu and go for the Download and install option.