"Transplanted plum tree" - pruning

I have a Victoria Plum that usually gives a large crop. Unfortunately, it had to be uprooted and moved today. It is about 15 to 20 years old so could well not survive. It did retain quite a reasonable amount of roots.

Does anyone have any advice on the best way to prune it and when?

Stone fruits are normally pruned in the summer this may help

https://www.blackmoor.co.uk/how_to_growing_tips.php

I've been reading up and apparently I shouldn't prune it as it needs its leaves to grow new roots. But it will need watering well for a couple of years. I will need to trim some branches where it has been damaged but other than that, I'll just thin it a little, water well if dry and hope for the best. I'll probably remove most of the blossom this year if it flowers.