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The whole point of AP is that your visa is still pending, for whatever reason. You have not yet been granted permission to arrive at the border so returning your passport for you to use your B-2 defeats the object of AP. 
 
You can get your passport back - many people do if they need it for business travel to other countries, for example. If you do get it back, it's almost certain that your B-2 has been cancelled. 

Actually you can ask for your passport back. They will ask for it when AP is over, the only other issue is whether they already canceled your B2. If they didn't it's not likely you will gain entry while in AP. 

Okay so there's a probability that it might be issued sooner than I think. I really hope it does.
 
Thank you so much.

The worst thing that could happen is:
1.  Denied entry when arriving at the US border and a quick trip back to Egypt....possible
2.  Added delay to your K-1...definiately
 
Hopefully, the AP will end and you can travel to the US via your approved K-1.......good luck...
 
 

You need to wait it out. I’m pretty sure you’re not able to get your passport back. AP takes as long as it takes. Some take days, weeks, months, or years. No one knows. Your tourist visa will be canceled if your immigrant visa is approved. Even if you had your passport back and wanted to travel to the US on your tourist visa, you would experience some difficulty at POE due to a pending immigrant visa petition. You’re better off waiting it out. Even if you were able to get your passport back and allowed to travel, you’d just be adding more time to your processing. 

You are welcome. Now that you are this far in the process I would advise browsing through the Egypt portal here because there are a lot of topics that might help you further with the process: http://www.visajourney.com/portals/index.php?country=Egypt&tpage=1&ppage=5&forum=80
 
Also you should get the instructions for Packet 3 from your embassy when you email them after your case arrives there and is ready.

check the status on the CEAC website and when ready you can setup an interview day and start the medical, but that might be depending on your beneficiaries country.