Tipping is considered customary in Egypt because many people depend on
tips as a main part of their income due to the low salaries of their jobs.

No one oblige you to give tips or give exact amount of it. The amount of
tipping is different depends on the service and how you think your
experience was worth, but an amount of 5 to 10% tip directly to the waiter in
a restaurant will be good. Also, if you like you can give tips on other
services like carrying luggage, parking a car.
The same with your tour guide and the driver. Tipping is completely
optional but should be considered if you’re provided with great service. If
you decide to tip feel free to give what you think your experience was worth.