从USCIS FAQ看，USCIS确实在优先处理带EAD的I-485

Q : Is USCIS prioritizing certain application(s) during the receipting process?

Yes. The Application to Adjust Status (I-485) will have first priority because USCIS needs to ensure that these applications are receipted in a timeframe that would allow processing of an application for an Employment Authorization Document (EAD) within 90 days of filing as mandated by law [8 CFR 247a.13(d)]. Our second priority will be to receipt the Application for Naturalization (N-400) so that we can minimize any delays in obtaining citizenship.