I agree, leave it while their are still flowers. I often remove the wilted ones so they don't spoil my enjoyment of the others.
It is one of the dangers of repotting while in flower, but sometimes you might just loose a couple of flowers and the others will be fine. I have a massive Phal with over 30 flowers which fell on the floor and half out it's pot, that dropped a couple of flowers a couple of days later but the rest are still going a couple of weeks later.
Give it a rest, In the wild they just die off, no need to hurry cutting it. Sometimes they will rebloom from the same spike. I have one that has been blooming for 4 months, and still looks good. Some close, others open. Enjoy! that's what we grow them for,,,their blooms. You can always cut it after all the blooms have died, but then just cut down two or nodes and leave the rest to see if it will rebloom.