If you are in the U.S. and in a legal status (or 245(i) or 245(k) eligible you can just file the I-485 when the Priority Date is current and the file will be retrieved from NVC. As a courtesty we always coordinate with NVC as well so they know you will be adjusting. don't switch it now though until your Priority Date is current and you know you qualify to adjust.
Lynne R. Feldman, Attorney at Law
Concentrating in Immigration and Nationality Law
2221 Camino Del Rio South, Suite 201
San Diego, CA 92108
phone: (619) 299-9600, facsimile: (619) 923-3277
Formerly Adjunct Professor -- Immigration law
University of Illinois College of Law