Magento 2 estimated delivery date scheduler extension allows online store customers to choose their purchased products order delivery date and time as per their convenience from a set of allowed dates.

Using this extension the Admin get the freedom to display only the dates on which it is convenient for you to make product deliveries

By offering this feature, you can ensure that the order gets delivered on time and leaves a good impression of your brand.

Some of the features of this extension are:
Allow customers to choose delivery date and time
Set intervals between order and delivery dates
Display Scheduler on the shipping step of Checkout
Let your customers add comments
Choose Date & Time format
Keep a track of Delivery Orders
Display Delivery Date & Time with additional charges

To know more : https://www.appjetty.com/magento2-delivery-date-scheduler.htm