I am assuming that you are the sponsor. If you are, did you give them your email address in the forms? If you did, they will email you the UCI number and if you didn't give the email address, they will send a letter which will be posted to you through regular mail and will take a few days longer to receive.
It is difficult staying apart but trust me, it is worth it in the end. With inland, it takes longer to process and your husband would not have medical coverage, nor any other benefits and would not have been able to work either. It would have been difficult if you were going to work and he was home getting bored.