yield return new WaitForSeconds(myAnimator.GetCurrentAnimatorStateInfo(0).length);
// Удаляем объект
// ...

public class WaitForEndAnimation : CustomYeildInstruction
{
    private Animator animator;
    
    public override bool keepWaiting
    {
        get { return animator.GetCurrentAnimatorStateInfo(0).normalizedTime < 1.0f; }
    }
    
    public WaitForEndAnimation(Animator animator)
    {
        this.animator = animator;
    }
}

IEnumerator Start()
{
    yield return new WaitForEndAnimation(myAnimator);
    // Удаляем объект
    // ...
}