YITH WooCommerce Product Countdown allows you to show a specific countdown for each of your products on your product and/or category pages.
The combined use with YITH Pre-Order for WooCommerce allows you to show a countdown on a pre-order product until it will be available.
After installing and activating both plugins, when configuring your pre-order products, you will find a countdown section in the product edit page.
In this section, you need to enable the option Enable YITH WooCommerce Product Countdown for this product. The For sale date previously configured will show in the countdown dates.
This is how the countdown for your pre-order product will show on the product page.