Show shipping estimated time for specific product

Global – Shipping Estimate time same for all products

Go to Store Admin -> Online Store -> Customize -> Theme Settings -> Product Page -> Scroll Down to Shipping Estimated

Individual – Shipping Estimate time different for each product

Go to Store Admin –> Settings –> Metafields –> Click Products

Click on “Add definition” and add data as below

Name: Shipping
Namespace and Key: my_fields.shipping_days
Content type: Text( Select Single Line text )

Now go to your products and Scroll down to “Metafields” and Add date as shown in Shipping box and click save

Note : 3/7 means, Customer will show date after 3 to 7 days from today’s date.

You can check updated time on same product page.