Final answer:
In this situation, it is best to inform the supervisor that you cannot disclose any information without the client's consent due to client confidentiality.
Step-by-step explanation:
In this situation, it is appropriate to inform the supervisor that you cannot disclose any information without the client's consent. Client confidentiality is a crucial aspect of counseling to create a safe and trusting environment for the client. Sharing specific details about the client's progress and sessions would violate their confidentiality and undermine the counseling process. It is essential to protect the client's privacy and only discuss their progress with the supervisor if the client explicitly gives their permission.