For entry into Egypt and exit back to the USA I would check the US embassy for Egypt for covid requirements when you are about to travel. Things change with time. For us, we needed a QR code with your vaccination card or a negative RT-PCR test. We decided to do both, just in case. And although it states 96 hours from your last flight jnto Egypt, we played it safe by making sure we were within 72 hours from our LAST flight into Egypt for the test. The airlines varied, some asked for the vaccination card and another for the negative covid test. When we arrived in Egypt, the AbD rep who met us asked for the negative covid test.
Currently to return to the US, you have to have a negative covid test. AbD arranges for your testing st the resort. The cost is $100 per person and charged to your room.
Again, things keep changing so check the US Embassy site for Egypt.
The CDC just upgraded Egypt to level 3. Our Disney guide said if they reach level 4, most likely future tours will be cancelled.