For Family-Sponsored Filings:
In the F2A category, there is a cutoff date on the Dates for Filing chart.  However, the category is “current” on the Final Action Dates chart.  This means that applicants in the F2A category may file using the Final Action Dates chart for August 2019.

For all the other family-based preference categories, you must use the Dates for Filing chart in the Department of State Visa Bulletin for September 2019

For Employment-Based Preference Filings:
You must use the Final Action Dates chart in the Department of State Visa Bulletin for September 2019.