What are the chances of getting a waiver after receiving a Chapter 18 discharge?

I was discharged from the Army in 2011 after failing to maintain weight standards. After years of drinking, unhealthy eating, and losing my mother to not one but three heart attacks I got my act together, also largely thanks to my own wife and our kids. We recently moved from Dallas to KC for a job. That was back in November. I was 250lbs then. I’m down to 213lbs as of yesterday. I need to get down to at least 165lbs. A goal that I believe is possible by my next birthday, in which I’ll turn 32. That said, what are the odds that I’ll be able to get a waiver to re-enlist once so have the weight off? I’m older and wiser now. I’ve come to terms with the choices I made back then and I want another chance.