Can I delete my schools off FAFSA now and add ten more?

Hello everyone, hope you guys are having a wonderful winter break!

I submitted my FAFSA yesterday being the mega-nerd I am and I got an email today stating that my FAFSA has been processed successfully. Can I now go and edit my school list and delete my old schools to add new ones?
I’ve read some other posts about this and they all say that I should wait for my Student Aid Report (SAR). What is this exactly and when will I get it?

You should get a link to your SAR which will show all your inputs and the final calculations. If you haven’t received that in your processed successfully message I would wait to get that.