I thought you were talking about your naturalization application. For naturalization, there is the 120 day rule, meaning you may file a law suit 120days after your interview if still no decision. But I do not know about any related law/rule on I-485 application. Is the visa for your country of birth current? If not, there is nothing you can do unless your spouse was born in a different country and that country's visa is available (cross chargeability doctrine).
If the visa is current, then you may consider a law suit if the process time on your receipt has passed or if most people filed around the same time as you did have already completed their applications.
Good luck to you.
If the visa is current, then you may consider a law suit if the process time on your receipt has passed or if most people filed around the same time as you did have already completed their applications.
Good luck to you.