Samsung is now rolling out the November 2023 update for the unlocked Galaxy S20, S20+, and S20 Ultra units. As per the update changelog, the latest firmware rolling out with the build number ending with HWK1.
Unlocked Galaxy S20 getting November 2023 update
The November 2023 security patch fixes 60+ vulnerabilities in Android and One UI, along with some vulnerabilities that can be exploited on Galaxy devices with certain Exynos processors.
You can grab the November update for your Galaxy S20 series phone from Settings > Software update menu > Download and install.