You may only file for AOS if your priority date is current on either the final action bulletin or the AOS application filing date bulletin. You can find the bulletin at https://www.uscis.gov/visabulletininfo. In the interim, you must continue to maintain nonimmigrant status in order to file for AOS. You can read more about AOS at http://myattorneyusa.com/adjustment-of-immigration-status.
Answered on Jul 27th, 2016 at 3:20 AM