How can I know when a transition between two cameras ended ?

I have a virtual camera and a free look camera. At some point in the game I disable the virtual camera and enable true the free look camera and then it’s making a smooth transition from the virtual camera to the free look camera.

but I want that only when it finish to make the transition the movement from the virtual camera to the free look camera then to do something. Like a flag or something that will tell me when the transition ended and the view is now on the free look camera.

 private IEnumerator SceneCamToStandupCam()
    {
        yield return new WaitForSeconds(3);

        sceneCamera.enabled = false;
        freeLook2.enabled = true;

        animator.Play("New State");
    }

Somehow I need to find when the transition is ended between the sceneCamera and the freeLook2 camera.

Ah in the CinemachineBrain there is a Default Blend set to Ease Out by default and also set to 5 seconds by default.

This 5 second will set how long the transition will take between the two cameras. This is the value I needed to get.
Working great.