I can tell you what happened during our visit....
Very helpful, friendly psychologist came. Asked me a few questions without ds present, how I feel he's doing, what I think his needs are, what his behaviours are etc, very informal but he was taking notes
He then asked to see ds who entertained the idea of questions for maybe 5 minutes (he was 5 at the time). Edpsych asked ds to write his name, read some cvc words, write some numbers, do some simple maths-7+2 etc
Ds was getting distressed by it all so edpsych stopped and then asked me some more
Was more of a informal chat really rather than a medical/mental appointment. He asked if I'd like a copy of his final report, I said yes, that was that. Over in maybe 45 minutes ish
Hope things go well for you