1. Don't promote this guy unless he's not in your future plans at LF/1b (i.e. you have an incumbent signed to a long term deal, another prospect who is limited to LF/1b and better, etc). He still has potential development so playing every day, at whatever level, is the most important thing.
2. When he does get to the majors, be prepared for him to have a couple of AWFUL seasons mixed in with the decent and very good seasons over the course of his career. Guys with splits like his (i.e. reverse-LH favoring, average) figure to have up and down years. Nice, solid all-around player with no exceptional skills but everything at least a bit above average and some very good attributes (eye/power). He might only be league average offensively at 1b/LF but he'd be a very good defensive 1b and average LF.