Want an iPad Pro? You can find some models in stock at your friendly neighborhood Apple Store. You can order one on line and have it arrive as early as Monday. Even the most expensive models will ship to you within two weeks (at least in the US).
Want an Apple Pencil to go with that? Yeah, sorry, you’ll have to wait 4 to 5 weeks:
How about a Smart Keyboard? Same deal. 4 to 5 weeks.
As John Gruber said in this post:
Getting a new iPad Pro without a Smart Keyboard or Pencil is no fun. Sort of a joyless launch.