If you are going on vacation/holidays and would like your products to remain visible and allow customers to still purchase your products, you must inform them, in advance of purchase, when the products will be dispatched.
The following video will explain how to do this with the use of Global Add-ons. https://youtu.be/t9LDCo2KhaA
On return, please delete the Message by going to Dashboard > Settings> Store Settings/Add-ons and delete the Add-on