I wouldn't worry just yet. My company deals with ups on a daily basis and a few out of a hundred don't get scanned by ups and they still get delivered on time. When you think of how many people ordered the watch its bound to happen. I believe you will get your watch.
Whether it gets scanned or not... Apples not delivering a product without getting their money.. A ton of people that are waiting still have not gotten charged me being one of them. I am glad/happy for those whom did receive their order today.
However , its 5am EST my time and there is no action from my BA or Apple, so highly unlikely that it will arrive today.