Yes. A move to telepractice represents new/different risks to your clients and therefore members are expected to obtain informed consent. Clients may wish to opt out of services delivered in this way once they understand the risks.
You might consider “how” you gather consent as it does not need to be in writing (consent can be verbal). Consent (or refusal of consent) must be documented.
Your informed consent discussion should include information about added risks (e.g., privacy), the types of services you can/cannot provide in this manner, and any other information that might be specific to their situation.