Yes defo fence off the fruit trees with electric fence, otherwise they will just use them as scratching post, and once loose will dig them up. Especially when they are older and bigger.
My hens don't go into the pig's pen, even though right next to each other. But hens are not free-range and only rarely one gets out. Have seen the pigs chasing pheasant with a death wish though... but not sure they got him.