USCIS has announced that for February 2018, adjustment of status applications based on a family-based preference must be filed using the Filing Dates chart and that for those based on employment the Final Action Dates chart must be followed.
The benefit of filing the adjustment of status application, even if not approvable at that time, is that the applicant may receive the employment authorization document (I-765) and the advance parole travel document (I-131).