Google has rolled the Material 3 Expressive UI changes into Android 16 QPR1 Beta 1, which you can download and try out today on a compatible Pixel phone. Note that this is aimed at developers and may not be stable enough for a daily driver – a stable release is expected next month.
Android 16 UI changes: quick settings redesign • live updates
Android QPR1 Beta 1 (QPR stands for “Quarterly Platform Release”) can be downloaded if you join the Android beta program. It supports the following Google devices (from older to newer):
If you run into issues, you can check the Android Beta subreddit and Google’s issue trackers.
PS. In case you missed it, Google announced Wear OS 6 today, which will also incorporate the Material 3 Expressive UI design.