Apple's Homepod has so far been a flop, only managing to capture 6% of the smart speaker market as of June 2018. The picture is even more bleak among Apple's own consumers; of Apple users that own a smart speaker, only 2% have purchased a Homepod.
https://www.notebookcheck.net/Apple-s-Homepod-had-a-mere-6-share-of-the-smart-speaker-market-in-June-according-to-CIRP.333238.0.html