Don't worry, you're not alone. I ordered 4:30 PM GMT on Thursday the 15th and my order is also listed as "Not yet shipped". Apple Support told me it was scheduled to be shipped on Monday the 19th, but because of the vulcanic activity, it wasn't. Hopefully something will happen soon as the airspace is open again - I'm DYING to have my MacBook Pro shipped!
Damn vulcans.