It's hard to say. Apple typically receives shipment on a daily basis. I don't think they receive shipments on a Sunday. When they receive shipments, they usually update the website for in-stock. It updates throughout the day. As far as I know, Apple Store set aside for walk-ins and have some set for online order in-store pick up. So just because apple.com shows that it's unavailable for pick up doesn't necessarily mean they are out of stock. So check the apple store to see if they have them.