Your climate is too cold and getting cold too fast for Desert king to risk and grow the little embryos late in the Fall.
So they are there ,Invisible till climate permits them to grow.
If the tree is not protected,from cold,those invisible undeveloped embryos will die,so there will be no breba crop,on Desert King for you,and the main crop will drop too from lack of polination,and you will end up with nothing.
If you do not have a place to take the Desert king early,before frost starts,and keep it at 40F,till Spring,then do not bother with it,because,those little invisible Embryos die first from frost.