I very much doubt this will ever happen, but there are always surprises. 

Sonos speakers are Airplay receivers, not transmitters.  I highly doubt it is even possible, never mind probable.

That’s why I asked about the Amp or the Port.

Perhaps jgatie’s statement wasn’t as clear as it needed to be for you.

There are no Sonos devices at all that can generate an AirPlay 2 signal. There are many Sonos devices that can receive an AirPlay 2 signal, including the Sonos Amp and the Sonos Port.

To my knowledge, Apple reserves the right to generate AirPlay 2 sources to their own hardware, and only license the ability to be an AirPlay 2 receiving device to other companies.