https://www.cnet.com/news/google-announces-assistant-on-sonos-speakers-coming-in-2019/

Google says the Assistant will enable users to "control your favorite music, podcasts, and radio stations from all over your home" on the Sonos One and Sonos Beam.

Crucially, Google also said that the other Sonos speaker models will be also updated. So you'll be able to control them with the Google Assistant too.