I am a J visa scholar (Postdoctoral Scholar, Researcher, etc), will I need to file to Extend my Nonimmigrant Status?

Yes, on or after September 15, 2026 you will be required to file an I-539 application to extend your status in the U.S. You can file the I-539 application with USCIS up to 180 days before your current status in the U.S. expires.