Definitely agree with this. Patience is the virtue. If you ordered right at pre-order and you were given the 9/22/17 delivery date. YOU will get it on the delivery date. Calling Apple will probably not help as if you give them your order number, they will simply tell you what's on the page.
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Not sure how that that works with UPS. But for Fedex even if you get tracking today or tomorrow, you still can request a hold for pick up for the promised date delivery. I'm pretty sure that's the same case for UPS. Whether it's UPS or Fedex. I will jump on the tracking page on Thursday 9 PM and will request a hold for pick up on Friday. Never had any issues with this.