Google Assistant is now available on Sonos. See here
for more information.
It is just embarrassing that a company of the size of Sonos is incapable of delivering a damn voice assistant integration. Something dozens of other manufacturers, way smaller than Sonos, already managed OVER A YEAR AGO. Sonos charges more for their product, yet is not capable to actually giving us a reliable timeline. They are not giving us updates since November (and that demo in January) and literally treat their customers the worst. By the time they roll out Google Assistant I hope most people have moved on from this incapable brand. At least their share price reflects their commitment.