new turkey hens
At least a week if not a little longer.
I agree at least one week but if it was me I would probably be a little over causes and go for 2 to 3 weeks and only let one out at a time at first and keep an eye on it while its let out.
If you had raised them from Poults I would say 8 to 10 weeks of age and do as I suggest below.
Place water out side for them to get to but do not allow them feed any where but in there Pen and do not allow them to come and go to feed.
Like Kids ether out or in LOL.
At some point they will want to go back to the pen to eat there feed.
I free range my Turkeys part of them at a time and the ones out side do not roam far from the ones still penned up its a flock thing.
Dont forget that some Turkeys do fly if there is a problem with them flying simply clip a wing go to youtube
Sounds like you have done whats needed and its great that you have fresh fruit for them I bet they love it but watch giving them to much as with Humans to much may give them the runs and for Turkeys thats not good.
If you can post some Pictures of your turkeys and setup.
Here is what I have its far from being fancy but it works.