https://wccftech.com/galaxy-watch-4-is-finally-getting-google-assistant/

It has been some time since Galaxy Watch 4 owners have been waiting for Google Assistant and that is finally happening today as Google has announced that the update is now available.

Google gave us the first glimpse of how Assistant looks on Galaxy Watch 4 a few months ago; you now have a new design that is much similar to the experience you get from Pixel phones. You can launch the Assistant with the "Hey Google" command and it will open a full-screen UI with black background along with four-color light bars at the bottom that will react to the voice input.