@sdre since we're countrymen...
When you say "delivery was slated", do you mean the initial projection UPS gave? Cos that is often incorrect, which also happens for Fedex and UPS. Eg. when package is shipped out say 1 Feb, it may initially be slated to arrive 3 Feb (and UPS will state that), but may be delayed to 4 Feb due to customs.
The only time I can be certain that the package will be delivered is when it says the package is actually out for delivery, then I know it'll arrive that day. Even then, the timing (as you've said) is variable. It may well arrive at 8pm though scheduled for 1100-1800.
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