He tells Anthony DiComo of MLB.com that he's about a month behind the other pitchers in camp. He hopes to get into a Grapefruit League game before spring training is done but isn't guaranteed to do so. The injury tracker at MLB.com lists his expected return as early May.
Basically, back in the day, MLB had a problem with some teams signing and stashing guys that could probably be productive major leaguers in their farm system. This was all before the Rule 4 (amateur) draft and stuff like "international amateur free agency" with bonus pools and the like, and basically the idea was that MLB wanted MLB-caliber players in MLB, not waiting in the wings.