Not sure about when the produce comes in. On Sunday at that time, the Grand Marches will all be closed. Market Garden (corner of Billy Folly Road) will be open, as well as the Maho Market, which would be the closest grocery store to Summit, probably. However, I have not been particularly impressed with the Maho Market, as far as freshness, etc. If it were me, I would probably go to Market Garden. Or, get a few first day items from Jeannie at ShopnDrop, and then go make a big grocery run on Monday.