According to the issue #60 of the GitHub :
The SM seems to be finished (issue #62).
the Loader seems OK too (issue #61).
I can't post any link, see the first post to get to the project's GitHub page.
There's a Linux Joycon driver on GitHub (I don't have enough messages to post links, search "riking joycon" on Google). Maybe it's possible to compile it.
EDIT : And the sound seems OK with the Ubuntu image that a guy have on the other section.