Product Pre-order
This article also help you know how to configure the notice: "Will not ship until..." for Pre-order products.
On the Kalles demo, you see this feature on Pre-order products, if you wanna achieve it for your store, kindly follow the instruction below.

1. Enable Show incoming message

From Customize > Theme Settings > Product Single > Tick on the Show incoming message checkbox to enable the message on the Product page.

2. Configure Estimated arrival date for Pre-order product

From Shopify Admin > Products > Open the product that you configured as a Pre-order product. You guys can configure follow my video below:

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