Check if IK LookAt has reached the max rotation

I have an video to explain:

As you can see at the 0:21 from video if I'm behind the enemy and he can't rotate his had to much because it reached the max. How to check in c# when this maximum angle rotation for has is reached. If it is reached, i will move the entire body.
Code:

Code (CSharp):

1. private void OnAnimatorIK()
2.     {
3.         animator.SetLookAtWeight(1);
4.         animator.SetLookAtPosition(Target.transform.position);
5.     }