Support for concrete staircase (console) cut off. How to repair?

The construction company has already started with the repairs. See pictures. The managing director informed me orally: - he works according to the repair plans of the structural engineer from the concrete plant, who planned and manufactured the stair support. He does not need my approval as the client for this - after completion, he will have the work inspected by a construction expert - he will send me the plans from the structural engineer. I assume that the acceptance by the expert will also take place. I have not received anything from him in writing yet. I was not present during the repairs and was not informed about the start of the repairs. I am interested in how it is possible to prove now how deep the inserted steel rods are?