If you’re using a phone with Android 10, you might’ve noticed another update option called the Google Play System Update pop-up in the settings above the System Update option. If you’re wondering what it is, it comes from Google’s Mainline project designed to speed up security updates. Folks over XDA-Developers have explained Project Mainline very well.
A developer and a Twitter user @jasOnsg spotted the Google Play System Update progress percentage on his Pixel 5 after receiving a Google Play System update.
XDA-Developers reported that the functionality would’ve been added through an updated APEX module. If you’re nerdy enough to understand, it is a container introduced in Android 11 that helps install flow for lower-level system modules.
The Google Play System Update progress percentage will be visible on phones running Android 12. If you see a Google Play System Update and want to know what’s changed, you can run the following command.
pm list packages --apex-only --show-versioncode -f