Is rotation is close enough to shoot?

Hi Community!

I have a turret that is rotating to the enemy. Now i want to check, if the current rotation is "looking close enough" to the enemy that the turret can shoot.

I rotate like this:

 Vector3 lookPos = enemy.transform.position - this.transform.position;
 Quaternion targetRotation = Quaternion.LookRotation(lookPos);
 this.transform.rotation = Quaternion.Slerp(this.transform.rotation, targetRotation, Time.deltaTime * RotationSpeed);

How i check now, if the rotation is close enough to the target, that it "can shoot"? (it does not need to rotate 100% in the right direction, to shoot, maybe 5% diffrence is ok)

Thanks n3v3r001