Sandra ... my first EMG was in a private doctor's office on a rather antiquated machine. It produced a tape that he had to send somewhere to be read, and it took two weeks for the results.
My second EMG was at a university ALS clinic, and I got the results immediately, along with the diagnosis. They had a gang of counselors waiting to descend on me with piles of literature, etc. I asked them to send me the written report when they wrote it up, which they did.
(Note ... I had already had a ton of tests eliminating other mimic diseases. If you still need screening to reject other possibilities they may not make a diagnosed on the spot.)
MRI is different. They send report to prescribing physician, and you have to get the results from him/her. At least, that's how my doctors work it.
Good luck!