These smartwatches are compatible w/ Wear OS 3 - 9to5Google

Google has so far confirmed that only a handful of current and upcoming smartwatches will be upgradeable to Wear OS 3 later this year.

Xiaomi could be working on a Wear OS 3 smartwatch

TicWatch E3's Future Wear OS 3 Update Makes it a Better Buy

Wear OS - Make every minute matter

Google Fit is missing from Wear OS 3 - The Verge

Wear OS - Wikipedia

Xiaomi could soon launch a Wear OS 3 smartwatch - Android Authority

Create Your Own Assistant Shortcuts on Wear OS, by Cuul Geek

Fossil is finally launching Wear OS 3 for its smartwatches

Fossil Wear OS 3 update removes Google Fit and Assistant too

Google reveals Wear OS 3 update path for current watches - 9to5Google

Google and Samsung rumoured to be developing Wear OS 5 based on Android for Galaxy Watch7, Pixel Watch 3 and other smartwatches - News