You should be fine. Digital Stores (QOL's online distributor) won't care about international release dates, regardless of timing delays. Same goes for other international stores, like Amazon UK/Europe. They are not bound by such restrictions.
As for how long, if they go through Royal Post which is the equivalent of Canada Post, might be up to two weeks, but no longer. Usually I get British post mail quicker than US mail by about a few days, since normal USPS parcels tend to take two weeks on average to arrive, and same with most Japanese parcels I get sent by SAL mail. I've even had UK mail come in a week!