To be brutally honest I don’t remember all the nuances and important details of starting HRT, but I’d hope very much that if you’re undergoing that process your treating Doctor would have informed you exactly of what to expect, and a brief timeline of such events.
Basically: dick growth, sensitivity, hair growth, voice breaking, pimples, sweat, hungry, horny. You’re going to go through puberty, man. And all that comes along with it.
Happens at different stages for different folks, as hormones react individually with your body as opposed to someone else’s.