No they don't, but it's in the pipeline... Shame they're pricing themselves out the market though when the likes of Netflix and Amazon give HDR and UHD at a much lower price. The top package on Netflix is just £10/pm and no fixed contract.
https://www.whathifi.com/news/sky-q-to-get-hdr-update-double-4k-offering-and-spotify
Yup netfix is great, activated my free trial a few weeks ago and dolby vision is superb.
Although I only use it for netflix exclusive shows as the quality for the rest of the stuff is still generally not as good as other sources, be that amazon, blu ray etc.