We have a 95% complete version that is soon ready for Steam early access as well as an update on itch.io. "Soon" may still be a few months though as our time for the game is limited by the little spare time we have after our full-time jobs and families are taken care of. But we're (slowly) making progress all the time!
The next version will include the single-player career mode, more cars and tracks in a shape that really could be released as the final game (although not with all the bells and whistles we'd like yet). However we know we can do better and hopefully we can get this up on Steams early access program early next year and continue improving it until its ready, giving you the chance to help shape the game by giving us feedback along the way!
We've updated the Roadmap section with the current plan.
Happy holidays retro-racing fans!