I agree with the other posters about using plywood, and I apologize for not suggesting that earlier. We know that a solid inside slab with solid edgebanding is definitely 100% impossible to work, but this is not what you are doing.
I was initially thinking 4 joints in the edging. One at each end of the oval, and one at the halfway point. The more the better, and after reconsidering the size of your piece, it might need more joints on the edge.
I guess what I should ask is if you want a purposeful reveal at your edge joints. A better look might be a lap joint instead of tenons. Then you can pocket screw the edging on and the joints will allow the movement. If you don't want 1/16-3/8" reveals around your tabletop, then you definitely need to go with plywood.
I've made a desk with a curved butcher block front that had lap joints. The panels were screwed on from the back to allow movement.