https://www.cnet.com/news/google-wear-os-watches-get-upgraded-assistant-and-actions/

Google Assistant is already on over 5,000 devices, and smartwatches are some of them. While Google software features can be summoned on Wear OS watches (Wear OS was formerly known as Android Wear), it hasn't been quite the same as what you can get using a Google Home smart speaker. But it's become a lot closer now, just a few days ahead of the Google I/O developer conference.

Upgraded Assistant features should be arriving soon, Google announced today, allowing contextual responses to Google Assistant requests on the smartwatch screen, plus support for Actions, custom commands that can control connected gadgets.