The national goal is simply a benchmark set by USCIS. It is not a firm guarantee that the application will be adjudicated in that time frame. You can continue to wait for a decision or schedule an infopass appointment with the local field office to inquire about the case.
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If it is outside the stated processing time, the first thing to do is call the National Customer Service number at 1-800-375-5283 and make an inquiry. If you don't get a satisfied response then you should make an infoapass appointment with the local New Orleans office.