https://www.theverge.com/2018/7/13/17566422/sonos-airplay-2-how-to-setup-apple-wireless-multiroom-audio

Sonos is adding support for Apple’s AirPlay 2 wireless audio standard to its speakers, making them far more versatile for anyone who prefers Apple Music (or just likes using Apple’s music app for local music on an iPhone). AirPlay 2 support also means that you’ll be able to use a Sonos speaker in conjunction with Apple’s own HomePod in a multi-room audio setup — an intriguing option for anyone who can’t decide between the two companies. Here’s how to get everything set up:

First off, you’ll want to update the Sonos companion app on your Android or iOS device. AirPlay support needs a firmware update to the speakers, and before you can install that update, you first need to download the update for the app that will let it do that.