Unless you have a crystal ball that can tell what the market will do later, I'd put it all in today.
Yes, it might drop; but you might also miss valuable time in the market if it goes up, and you're holding the cash.
DCA is a good strategy to put in new money, keep buying through the ups and downs, don't hold onto it waiting for a down. But when you have a lump sum, I don't understand why you would wait to put it in.