It will heal over by itself...to prevent from further damage, put chicken wire around loosely.

Thank you, Konrad. We have had wet weather this week so for now I have loosely wrapped the trees with burlap until they can dry out later this week when we have sun again. Then we are planning on wrapping them with a tree wrap for winter which we always do anyway. Do you think I need to wash the wounds out with soap and water, then spray with a fungicide before wrapping? I read that as a suggestion for this kind of damage online somewhere.

No need to wash...I do a white wash with latex/water about every 3 years which helps against sun scalding, and no wrapping out at the orchard. At home in town I don't spray because they're not exposed to sun all day.

Thank you!