Samsung got incredibly fast when it comes to security patches, often beating even Google to the punch. The story is different for carrier-issued updates, but compared to prior years, they've gotten quicker, too. As such, AT&T has started pushing the update to the S20 series and the Note9 while the Verizon S9 and S9+ are in for the patches.
August updates are live for Google's Pixels — notably behind some Samsung devices. The trend of intermittently skipping those "functional patch notes" continues this month, so we can't tell you what sort of user-facing changes or fixes you might see (if there are any at all), but it does include a good number of "high" and "critical" labeled fixes, so you'll want to pull them down sooner rather than later anyway.