Hey cyril_antony! Let me help you out with shipping here, it confused me at first too.
Oberlo does not import products with the shipping options (delivery time or cost) included to your Shopify store because they vary depending on where the items are shipped to. Therefore, you have to set up which countries you are going to sell your products to, and how much you want to charge your customers for the shipping in Shopify.
To find out shipping options and costs for India I would suggest going to your Explore Page in the app and selecting India on the left. Then the products and shipping options will be listed for you to choose from.
Afterwards I will link you our guide for Setting Up Shipping in Shopify as it will go through it step-by-step so you can be sure to not miss anything!
All the best!