Try to get your full diagnosis written down, at least as far as they know it at that point, so you can go home and investigate treatments which are suitable. Regarding the bone scan too - don't be worried they think you might have bone mets, but many hospitals do this in any case except for lowest grade cancer which doesn't need treating.
The diagnosis will be the parameters:
Staging (such as T2aN0)
Gleason score (such as 3+4), and the proportion of the two numbers in the samples.
Position in prostate: near the edge? near the nerves (and how likely is nerve sparing - preserving erections?)
PIRADS (or Likert) score from MRI scan (although this isn't very useful anymore once you have the Gleason score). Prostate size might be interesting too, but also not very useful.
For prostatectomies, do they offer Retzius Sparing (gives faster continence recovery) or Neurosafe (safer nerve sparing where they might not otherwise risk it). (Most NHS hospitals don't offer either, but you can choose to have the procedure at any NHS hospital willing to take you.)
What radiotherapy options do they offer?
Being at the young age of 50, where you may have many years to live still, very long term side effects of radiotherapy might be a consideration where they wouldn't be with an older person, but that doesn't rule it out.
PNI = means the cancer was seen inside nerve sheaths inside the prostate (these are nothing to do with the erection nerves). This very slightly increases the chances that very tiny amounts of cancer may have got out of the prostate which are too small to find.
EPE = extra-prostatic extension - i.e. it's come out of the prostate, but only just. This will be encoded in the Staging as T3a or T3b.
Yes, there's not usually hurry to make a decision, unlike some other cancers.
Let's hope they come back and say you don't have cancer!