The Delivery Rule states that the probability that a delivery person will arrive at the beginning of the delivery window is directly proportionate to your readiness to receive them. It’s compounded by the delivery’s size and complexity. The less ready you are, the more on time, or early, they will be. If you’re in the shower or not dressed at the beginning of the window, they will be at your door.
They don’t want to be, but that’s the rule.
Michael Seidel, writer 
The corollary is that if you have to go somewhere, the delivery person will arrive only after you are forced to leave…or if you stay, the delivery person will arrive at the end of the day (maybe!).
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Valid corollary. I’ve been on that end, too. Cheers
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