That'll be about $1500-2000. When I got my rear bumper replaced it was $1200 and I had a much smaller sent but same spot as that which they easily fixed. A quote to replace my quarter panel for rust was around $1500.
2500.00 approximately by a decent shop .needs a quarter for sure dont let anyone try and fix it it needs a new panel. They will have to blend the door and likely the decklid as well as the bumper damages .