We bought ours a day or two before, you have to return your Egyptian plates and stuff before you leave and that takes most of a day.
I would say your risk is low that you would not get on but when it's a week delay and you only have three I would try to secure/buy a ticket ahead of time. You can track down a number for the guy in Aswan and see how you can reserve a spot as best you can, but as you can imagine there's not really a internet site where you can pre buy your ticket.
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