I lived in Saudi Arabia for five years and traveled to Egypt twice in the 80s.
I had a lot of Egyptian friends as well. I keep up with new and events in that area of the World as well.
Even in the 80s there were risks associated with travel in Egypt. For example, when I got into a cab at the Cairo airport, before we exited the area, a policeman had the taxi driver provide his license and other papers, as well as my identification and destination that was documented in a book.
I wondered about such bureaucratic nonsense, but found out later from my Egyptian friends that the police enacted those protocols because taxis were taking tourists out to the desert, raping the women, robbing and murdering the men.
My friends warned me about a few things, never eat food from street vendors, in fact they said only eat at high level restaurants like four or five star hotels. They warned me about wandering around Cairo alone, not knowing what area that I might be entering. They advised me to only take taxis from the hotel or take tours with a tour company with a bus either mini or large.
Armed guards were not provided for our tours or the River Cruise that we took in Southern Egypt. That started in the mid to late 90s after a Bus full of Swiss and German tourist were attacked at the famous tomb of Queen Hatchept. (SP).
A few years ago the country deposed the long time strongman, Mubarak and elected a President from the party of the Muslim Brotherhood, an organization that sponsors terror, just not as overtly as Al Qaeda. That President was a total failure and the Egyptian people, at least most of them were happy that the military deposed him.
The new government has brought some stability to the country, but Christian churches are still burned and Christians attacked by terrorists.
Further, tourist have been targeted.
Security measures seem to work fairly well now, but there are still a fair number of terrorists in that country that may target your tour. The risk may be modest, but I am not prepared to take my Wife there at this point. (she has not been to Egypt).
Just be aware that Egypt as wonderful as it is, is not Europe and risks are more than slight.