Yes, you can configure the processing time by cart item as well as by-product level. Follow the below instructions to add delivery processing time in Magento 2 delivery date.
Login to Backend
Go to Stores ➤ Configurations ➤ AppJetty ➤ Delivery Date, you will land on the “Configuration” page. Now scroll down to the “Delivery Date Related Configurations” section and do the following configurations:
Display at: Select at which step delivery date selection should be given.
After configuring where to display, let’s configure the processing time.
Order Processing Time: Insert the Days to process and manage the order. If you have entered 0 it means you will provide same-day delivery.
Delivery Option Level: Choose at which step order processing time should be considered i.e. Global or Product-Level.
Note: If two products with different processing period are added in the cart, the final delivery
will be made based on the higher processing time.
After all the configurations, click on the “Save Config” button to save the configurations.