Right now, I can’t give you an exact timeline. The current state of the master branch (the nightly builds) is less than ideal. It will require some time to make it less buggy and sluggish.
I could, however, put together a minor release from the patches we already have there but building on the 0.1.2 release. This would include the new sorting types and instance blocking introduced in Lemmy 0.19.
You may need to log out and log back in if you are experiencing issues with upvoting, making posts as read, commenting, etc. In most cases, it seems upgrading to 0.19 invalidates the access tokens.