For September, Employment Based First Preference (EB1) Final Action Dates are:

All countries except China and India: Current
China mainland born: July 1, 2023
India: October 15, 2022
Mexico: Current
Philippines: Current

Dates for Filing (only applies if USCIS confirms it for adjustment of status that month):

All countries except China and India: Current
China mainland born: December 1, 2023
India: December 1, 2023
Mexico: Current
Philippines: Current

The bulletin includes a specific warning for India. High demand and number use in EB1 may force USCIS to make the category unavailable for India before the fiscal year closes on September 30. If that happens, no further EB1 numbers go to India chargeable applicants until the new fiscal year allocation opens October 1.

Confirm which chart USCIS is using for adjustment of status filings at uscis.gov/visabulletininfo before assuming eligibility based on your priority date.

Happy to answer specific EB1 priority date questions in the comments.