I wouldn't do that, Jackie.
You can leave it for now, until your stand is ready.
But then I would set aside maybe 2 or 3 cups of the live sand, and then wash out all the rest.
You can then 'seed' the sandbed with that 2 or 3 cups you kept alive. The live stuff will repopulate the entire sandbed within a week or 2.
If you use a good amount of live rock to start off with (vs. using all 'dead' rock) you shouldn't even see any cycle in the tank.
If you want to test it, stir up the sandbed right now and see how filthy dirty that 5 inches of water is going to get. You don't want to risk all that crud starting to rot, and then screwing up your water parameters for the next 6 months...