By 8, I suppose you mean Feb 8th. In that case, it is too late and don't have enough time to get your name formally changed at the Provincial govt level. Without that letter I don't think IRCC would agree to provide Citizenship certificate with the new name.
So, only option, I could think, is to get the citizenship certificate with your current name, change the name formally with your province office and then with that name change certificate you could apply for the passport. Let's wait to hear whether anyone else has different ideas in the forum.