The best I can tell you is that we had a 4:00 seating and it was dinner, but we were one of the first ones in there. That doesn't help much, I know.
I can tell you that if you are on a "cusp" between lunch and dinner, you might get the best of both worlds. It doesn't change that much, but there might be something good for lunch and then more fresh goodies brought out for dinner and you could get both!
I know when we went at 4:00 there was some stuff left from lunch and it was still really good.