Yes, using the Magento 2 Delivery Date Time Marketplace add-on the sellers can set the customer preferred order Delivery day along with the delivery time slots for their orders within the Magento 2 Marketplace.
Customers can choose their preferred delivery day and time for their order at the time of checkout.
After the customers have completed the purchase they can see their selected day and time slot in their order history.
If somehow the seller has forgotten to set the delivery day and time slots then the default admin set delivery day and time slots will be used. That’s how to set customer-preferred order delivery.