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.

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

Wear OS 3: Features, eligible smartwatches, and more

Wear OS 5 Could Come Within 12 Months - Talk Android

Mobvoi finally begins rollout of Wear OS 3 for TicWatch series (but did not provide any other details about the rollout, however) : r/WearOS

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

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

These Snapdragon Wear platforms are capable of supporting Wear OS 3.0

Fossil Wear OS 3 update removes Google Fit and Assistant too

WhatsApp arrives on Wear OS this summer

Wear OS 3 smartwatches confirmed so far - Android Authority

Google finally releases Music Wear OS app, but only for Samsung's new watches - The Verge

Soon, Google Assistant will stop working on Wear OS 2 devices