After months of development, I'm making SM 3 run through the wilderness. Yeah, SM3 is now live! Releases are available for download from Github, Snapcraft, and Flathub.
One particular thing to note is that SM 3 does not come with the auto-update checker because of privacy concerns. So, no update notifications will be made for versions after 3.0. However, if you downloaded it from either Snapcraft or Flathub(both Linux app stores), the updates will be automatically made available shortly after they're published. SM 3.1 will feature it as an opt-in Setting.