How can I get a documentation for my husband?

My name is Marisol, my husband and I have already started the process of petitioning an alien relative; however, he also qualifies for the Deferred Action for Childhood Arrivals Application. We are trying to see what would be the fastest way for him to get a social security in order for us to do our taxes. We have already sent in the Affidavit of Support form and are awaiting an update from the National Visa Center.