Dwayne writes

Normally it is best to do any pruning/lopping/ during the time of the year
when the tree is dormant.

But this doesn't apply to cherry trees, which are susceptible to
infection and best able to resist it when in full growth.

However, I have seen trees worked on at the wrong
time of the year and they survived. You might keep an eye on the part that
is effected and make sure it heals properly. If not contact the one who
said it would be OK, and have him fix it.


--
Kay