You can change your address online or by visiting USPS office. For online visit: https://moversguide.usps.com/?referral=USPS Youcan specify from what date you want your letters to be forwarded. But I do not think, USPS forwards certain mails such as immigrations, licences, but this is from what I know. In the meantime, change your address online at USCIS website and also call them since you have case pending.

Hope this helps!