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
More news suggesting Apple to forgo the profit and catch market share...
The only brand it competes with is Sonos. I bet Apple beats Sonos sales tenfolds.
Considering Apple only joined the smart speaker market a few months ago and they lack a lot of features, I'd say 6% is a respectable start