Actually, they're NOT!! At least, the one in Waterloo, Ontario (Canada) isn't. (but, they welcomed me to call back daily to check).
They DID confirm they will be available by the end of the week.
Now, that being said - larger metro areas could possibly have them today - people should call their local Apple stores and check (and post back here).
While they (Apple) did say this about the SS SG version with matching link bracelet they said nothing about any other version. They have sold plenty of products in the past for in store pick up when others who ordered for delivery had to wait so I am sure this will be no different. (That is how I got my iPhone 6 plus in fact). Now, I do believe though that Apple stores will likely have mostly 38mm models in store and less 42mm. That I am just basing on the shipping time differences though.Don't expect them to sell the SG Sport in stores until online orders are filled.