Please follow the below steps to enable and configure the “Delivery Date Scheduler”.
Go to Store -> Configuration. In the left column, you will see the tab AppJetty Extensions -> Delivery Date.
Enabled: Select ‘Yes’ to enable the Delivery Date extension. The extension is disabled by default.
Enabled at Admin: Select ‘Yes’ to let admin select the delivery date. This selection will be done at the time of creating orders from the backend.
Display Selected Delivery Date On: Select pages on which you want to display selected delivery date. It can be on different admin as well as front end pages.