thank you for your reply,
I am not a permanent resident.
So the expiry date of my temporary resident visa (and not the work permit). Is that what I understood from your reply?

Hello! I am applying for a Standard Visitor Visa from Canada. My nationality is Canada, and the purpose of my stay in Canada is post-grad work permit (expiry 2025). The visa in Canada is issued separately, and is called a temporary resident visa (expiry 2028). In the UK visitor visa application ...