“Apple affirmed its goal of June release for iPhone and expressed confidence in meeting its target of 10 million unit shipments in 2008 given iPhone’s superior user experience, which Apple referred to as ‘transformational,'” Neff wrote in a summary of his discussions.
Apple is not leaving things to chance as it seems most, if not all, AT&T outlets will have the iPhone ready for you at launch. The article doesn’t mention anything about Canada, but since the provider in those neck of the woods is Rogers, you can bet the largest outlets would have them ready for launch.
Source: Apple Insider