I doubt JV can get ready for the start of the SEC season. That may be speculation, but the rest of the team has been playing together since October. When Calipari made a public comment to the media about JV choosing to work out on his own, I placed significance on that. He rarely discusses specific players by name unless he is passing out compliments or conveying a coded warning.
Maybe not the start but around the beginning. I wouldn't shocked to see him back by the third or fourth game. That's all hinging on next week starting practice. The team has practiced together since October yes but think about how they've had Class the entire time. Finals are done next week. If JV practiced the next few weeks that would easily be worth double in time. All they're going to be doing over break is practicing. That would be a TON of practice time for him to start getting comfortable.