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.
Not yet, but I think I know what the problem is. I can probably fix it before this release.