Adding Companion and MIA/FLL to SFO

My friend is a Delta employee and I'm about to be added on as his travel companion. Can somebody shed some light on how long it takes once they receive the form to be activated?

Also, I'm going to plan a trip to SFO from either MIA or FLL July 8-10 or 15-17. Could somebody help me in knowing the costs of getting there and what the availability looks like?

Thank you and much appreciated. Excited to be able to take advantage of this benefit and don't want to bother my friend too much about it.

I believe you start at the beginning of his next pay period but it's been a long time since I was TC. I'll check later and see what I find.

Thanks, I appreciate any insight you can offer!