There shouldn't be a deadline to the split. It will be the same total price overall with 1 share before or 20 shares after. If you own stock prior to the split, you will get it. The only thing that you might consider is that stock prices have a tendency to jump right after a split like this and you might catch the rise if you buy before.
I've been watching as well try to decide as well but since the price keeps dropping...well was. I assume the fed stuff wasn't as bad as people expected based on the jump across teh board today. It was down to 2392..would have been a good time to buy.