None until he applies. Only a court can award it. If the step father is out of your life, he is out of theirs. He can try to apply but TBH he must understand that a he has very little hope.
The acid test of parent, (for me) would be "if they would sacrifice themselves for the child?". If not, why have PR?
Khan is correct, there is no automatic right for a step-parent to have contact. They would have to apply to court for a contact order. I''m not sure there is little hope though. It really depends on the nature and duration of the relationship between the step-parent and step-child.
If the step-parent had significant involvement with the child/children before separating there is every chance they will be granted contact, although it will need to be balanced with the any contact with the natural parent. As usual it is better to discuss and agree arrangements if at all possible.