It took me about 10 months before my voice was sufficiently stable to start trying to sing again. My singing voice is still not nearly as good as it was prior to T, but the more I work on it, the better it gets. I've been on T for something like 16 or 17 months now, and while my voice will still crack on rare occasions, it's stable the vast majority of the time. Don't worry, you'll get there. However, there's really nothing you can do to expedite the process. You just have to wait until things stabilize.
SD