It is taxed when you sold it already because here goes the gain. And usually, gains are always taxed and if you want to know more about taxation, it's either you to talk to someone who's living in Canada do and have done filed his taxation with his gains through bitcoin.

And the other option that you can do is to contact the tax agency and have a consultation with any taxation professional. Well, some information are searchable through google.

Like this one: Is Bitcoin Taxable In Canada?