To the OP:
It depends. Often Apple has lots of the new product already built and ready for distribution. Sometimes it does not, and it takes orders for delivery in a few weeks.
Often Apple can fulfill the first few orders very quickly (overnight), but as the orders add up you may have to wait a few days for them to fulfill it.
It is unlikely that any of the new products will "sell out" quickly so that you'll have to wait a long time. At worst you might have to wait a couple of weeks.
It depends. Often Apple has lots of the new product already built and ready for distribution. Sometimes it does not, and it takes orders for delivery in a few weeks.
Often Apple can fulfill the first few orders very quickly (overnight), but as the orders add up you may have to wait a few days for them to fulfill it.
It is unlikely that any of the new products will "sell out" quickly so that you'll have to wait a long time. At worst you might have to wait a couple of weeks.