You may hit it just about right. Was out there this weekend bass fishing, and things didn't look quite just right yet for the shellcrackers. I plan on going this weekend for them with a fisheries bioligist who knows where they are at, and will you give you an update of what we find.
One thing to consider, if you don't hit the shellcrackers right when you're here, you should be able to load up on the channel cats - they should be in full swing on the rip rap then.