If the only damage is the bent arm then it will all go back into place.

The big fear is if the mounting points of the suspension are moved out of place then you will still have problems.

Luckily for you those arms bend easy. Helped replace 4 this year.

If the mounting points are moved you will have to either replace the rear carriage (if it has one) or put the car on a frame machine.

Lots of modern cars use a carriage like our old K frames to hold all the rear suspension. They bolt it in as an assembly. If yours is that type and the carriage is bent you can probably replace it.

The big problem would be a bent frame or chassis.