If USCIS determines that there are more immigrant visas available for a fiscal year than there are known applicants for such visas, USCIS will state on this page that you may use the Dates for Filing Visa Applications chart. Otherwise, USCIS will indicate on this page that you must use the Application Final Action Dates chart to determine when you may file your adjustment of status application.
We discussed these (and other) issues of US immigration:
FAQ: Can a J-2 holder get a HRR 212(e) waiver without J-1?
Other: Retaining green card while in Canada; Starting my company, violation of status; I-140 revocation; Unused H-1B for quota exemption; H1B to H4 COS without latest Paystubs; EAD renewal separated from spouse; H-4 EAD approved in error; Effect of salary reduction; H-1 transfer, OPT travel; Visa Waiver apply for AOS; Retaining priority date; Visa stamping for H-1B amendment; Arrest without conviction; Reentry permit, etc.