Third red line from the bottom for me, not too late this year, best time to chop deciduous is when they are growing vigorously so they can heal the chop.
The reverse taper/knob in picture #3 of post #3 will require some reduction
Mine never seemed to mind root work at the appropriate time, had it in a fairly shallow pot for 10 plus years.
If your picture is current they seem to be an acceptable time for root work, however I'm not aware of your climate/USDA zone
If they are nursery stock which appears to be the case, the taproot situation is irrelevant, it only pertains to wild collected material.
I had a large specimen for years, very easy to care for except our climate occasionally got way too cold and I didn't protect it adequately.
No peanuts, bed of closed cel foam, sides same, 1" thick foam, foam insert in large pot and foam spacers hot glued to secure small pots from moving at all, then topped with another sheet of 1" foam.
Crazy attention to detail.