Ah, I got it. Many people refer to the process as “transitioning” 
In his case, I believe he would just go by “man” but that is a personal choice. Some choose to drop the trans and others don’t.
Yes, it is a brave new world and one that we’re all still exploring. I, for one, am grateful that I live in a time when we can talk openly about these issues and that there is assistance for people that want to transition. We’re not there yet, but I’d rather be born now than any time in the past!
(Fwiw, I am not trans. I don’t identify as fully female but I go by the term “queer” for both my sexuality and gender. Working in HIV/AIDs though, I constantly have to be up-to-date so as to reduce chances of offending clients who have already many negative experiences with medical personal.)