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WordPress WooCommerce Pre Order Plugin allows the customer(s) to purchase a product from the store which is currently out of stock. And a customer can even purchase products which have not arrived at the store.
The plugin is very flexible in many ways as customers can order the items with multiple stock units with partial payment as well if allowed by the admin.
Note: If a client has applied ajax to the add-to-cart functionality via any third-party plugin on the product page then it will break the plugin functionality because by default WooCommerce does not support ajax to the add-to-cart functionality on the product page, it is applicable on all archive pages like shop, cart pages.
The shipping will not be generated at the time of pre-order, else it will be generated once the product will come back in stock and the buyer places the order again.