Right now, MSU, UT, and Vandy are all in. Arkansas, Florida, Kentucky, and Ole Miss all have work to do. The UK-UF game tomorrow is huge for both teams. The loser will probably have to make a lot of noise in the tourney to have a shot at an at large. And even the winner probably won't get in without a win or two in the SECT. Arkansas probably just needs to avoid going 1 and done in the SEC tourney, but they'll probably have to face Vandy in their first game, which will be difficult.
I think the SEC gets 5 in. Whichever of Arkansas, Florida, UK, and Ole Miss do the best in the tourney will get in as at larges, and honestly I'd say Arkansas has the best shot at an at large, and Florida has the worst. UK and us are on about the same footing for opposite reasons, which could make our game with them in the 2nd round (assuming we get there) an elimination game.