Does the comb on the bird look pale compared to the others or purplish? If so, the bird is in congestive heart failure and should be processed right away.
If you pick it up, does it try to put weight on either leg? If you put food in front of it, does it eat? If it is a leg problem, it will likely survive till your hubby gets home if it is eating and drinking.
If it is just its leg, you can separate it from the others to keep the other birds from injuring it further, then process when your hubby gets home. That is what I would do if I thought I could keep it relatively comfortable....but I am used to processing with help.
How old is it?