Different hospital trusts have different policies regarding timescales etc. Your's does seem unusually efficient. Running the MRI on a weekend is very good use of resources. Results are best done face to face. There are plenty of stories on this forum about receptionists giving misleading results, so it is understandable that you have to go in to hear them.
The fact a biopsy is not required is probably good news, the fact you are 60 means you are more likely to have prostate cancer than not have it, and the elevated PSA is a hint that you may have it.
Nearly every man will get prostate cancer, and for nearly all of them it will lie dormant or progress so slowly it will never be a problem.
The doctor would need your opinions on this as well. The subtle balance of probabilities are too finessed to be discussed on the phone so a meeting is better.
So don't let this spoil your weekend, and don't waste your time turning over in your mind what you will do if the doctor says this or that, because until you hear what the doctor has to say there is nothing you can do.