Whether you ship from China or from the USA, products made in China are subject to Canadian duty.
If you import from China to the USA, the Chinese products will be subject to Trump's tariffs on Chinese-made goods.
In either case, the Location on your listing should give the point from which the item will be shipped, not your own location, to notify the customer that there could be import fees.
If you have a choice of shipping single items from China, depending on the value, CBSA may not assess each parcel for duty and sales tax (plus the Canada Post service fee of $9.95).
