how long till im a pro singer?

It usually takes at least six months to become a better singer.  However, how quickly you become a better singer depends on how quickly you are able to put into practice what you are taught.  

I've been singing professionally for almost 40 years, and still "mastering" it. I think you mean "proficient". And no one can answer that. Singing is learning how to play an instrument (that consists of lungs, throat, vocal cords and mouth). How long it takes you depends on how hard you work on it and how much you practice just like any other instrument. That's like coming on here and asking "how long until I master the guitar?"

probably a day