https://www.theverge.com/2018/7/11/17559380/sonos-airplay-2-support-software-update-download

Sonos is bringing AirPlay 2 support to its modern speakers today through a new software update. AirPlay 2 will work on the new Sonos Beam, Sonos One, Playbase, and second-generation Play:5 speakers, but if you have older speakers then you can group them with one of the compatible speakers to make AirPlay 2 work with them. AirPlay 2 is designed to allow iOS users to select the speakers they want to play music through thanks to its new multi-room audio support.

Siri is also more closely integrated into AirPlay 2 on an iPhone, so you can ask the digital assistant to play music on specific speakers. As modern Sonos speakers support Alexa, you’ll also be able to control the playback of AirPlay 2 music on Sonos speakers. Once the music is playing via AirPlay 2, you can ask Alexa to pause, go to the next track, or ask what’s currently playing.