Last year, we learned that Google was working on a new file system called Incremental, and we believed Google would use it to let you play games before they're done downloading. Today, Google made this official as "play as you download."
Launcher devs can add support for Incremental by showing a promise icon and download progress indicator on the home screen while the app is being incrementally downloaded. Use PackageInstaller.SessionCallback#onCreated and LauncherApps.Callback#onPackageLoadingProgressChanged
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Games are automatically detected if the developer adds the category of their app to CATEGORY_GAME in the Manifest. Game devs need to opt-in to support Perf or Batt Saver modes with appropriate metadata in their manifest.
We don't have screenshots of the new Google Play Games widget in the game dashboard yet. Code for the feature is there, but even if you pass the app's API level 31 hard check (beta 2 is still marked as "S"), Play Games still won't show the widget in the dashboard.