https://techcrunch.com/2018/07/11/you-can-now-stream-to-your-sonos-devices-via-airplay-2/

Newer Sonos devices and “rooms” now appear as AirPlay 2-compatible devices, allowing you to stream audio to them via Apple devices. The solution is a long time coming for Sonos which promised AirPlay 2 support in October.

You can stream to Sonos One, Sonos Beam, Playbase, and Play:5 speakers and ask Siri to play music on various speakers (“Hey Siri, play some hip-hop in the kitchen.”) The feature should roll out to current speakers this month.