I agree with Sneakersjay about working out as much as you can before your surgeries (whichever order you do them in). Having atleast some pec definition will help with scar placement etc.
In terms of changes on T, as others say, it does depend on the person. I know someone who at 1 year on T, had a beard. Yet, Im over 3 years, and grow stubble on my chin, and that is it (no lie, unfortunately. I cant wait for facial hair!). However, my muscle definition increase has been much more noticeable than his, and my voice dropped quicker and lower.
Changes can take a long time. For example, I know a guy who, got very manly looking hair within 2 months on T. Mine didnt. But, over the past few months, my leg hair has increased significantly.
Youll just have to see how things go, but if youre getting frustrated by your changes feeling slow, what I will suggest is, make sure you dont compare yourself to others! Itll drive you crazy. Just focus on the positive changes you notice in yourself 🙂