There's actually no hard and fast rule about size pre-meta. They can perform the procedure on just about anyone. The issue you'll run into if you're not an ideal size is not being able to reach past the fly of your pants to pee standing up.
The best indicator of suitability that I have heard is that your dick extend past your labia. Once that happens, it's highly likely that you'll be able to pee standing with no issue post-meta.
And growth can continue after a meta as well. I am 1 year on T and ideally planning on having mine sometime this year before the 2 year mark. If there is any additional growth to be had, it'll still happen regardless of the procedure being done.
You can also look into pumping and DHT cream for additional growth. DHT has some pretty heavy side effects though, so I'd encourage you to really do your research. My plan is to pump consistently from now until surgery. Take recovery time off, then ease back into pumping up until I've hit the 2 year mark. After that, I'll look into DHT if I'm not satisfied with my size.
You're only a bit smaller than me. I wouldn't worry about your size being an issue to have the procedure.
Hope this helps, happy holidays to you.
