You'll have a truly exceptional TE prospect the likes of an Eric Green or Vernon Davis once in a blue moon, but for the most part, it's exceptionally rare that TE's get a 1st round projection.
I wouldn't be surprised at all if he declared for the draft after the game. Since he already has a 2nd round projection, it's unlikely he'd gain anything by staying another year.
Maybe with an outstanding showing at the NFL combines, he could possibly sneak into the 1st round, but that's a separate issue.