. . . the brick tower that only now, he notices, has the shape of a cross embedded into the stone.

[shootingstar]

He rubs his temple to stop the buzzing and walks to the bottom of the path. He stares at the dark building with its modern brick tower that only now, he notices, has the shape of a cross embedded into the stone.

(From A Terrible Kindness by Jo Browning Wroe, Part V, Aberfan, scene 64)

Are the commas at "he notices" placed correctly?

 

[Rover_KE]

Yes.