This means Galaxy Watch 4 owners no longer need to depend solely on Bixby for their digital assistant needs.
To get Google Assistant on your Galaxy Watch 4, head to the Google Play Store. You can find the Assistant app there and install it on your watch just as any other Wear OS app.
Once installed, you can use Assistant for any tasks you normally would. You can ask it to search Google, turn off your lights, open an app on your watch, set an alarm, etc. To launch Assistant easily, you can configure your watch to activate it with a long-press of the home key.
