Hey there!
Off the back of what Roan said, you’d be better off using an app for this. Just wanted to throw my hat in the ring and say that we just launched a new pre-order app, Early Bird, which was specifically built with scheduled pre-order campaigns in mind (so you can set a start and end date and not have to worry about when to switch it on and off).
It will still show on your store, but will be “Coming soon” until the scheduled start date, at which point it will auto-publish and be available to purchase.
We have a bunch of other features around partial payments, discounts, custom messaging/labels etc., not to mention analytics too. If you’d like to give it a go, we have a 100% free plan you can use to try it out.
Let me know if you have any questions! Hope we can help.