Will Shipping Rates Calculator+ display carrier calculated rates in my Shopify basic plan?

If your store is in the United States or Canada, USPS and Canada Post carrier-calculated shipping rates are now available for all Shopify plans, please take a look at  https://www.shopify.com/blog/calculated-shipping-rates-for-everyone

You can also contact Shopify to add carrier-calculated rates for other countries or other carriers by a small fee, please see https://ecommerce.shopify.com/c/payments-shipping-fulfilment/t/real-time-shipping-rates-252510
Shopify sometimes offers this feature if you pay one year in advance.

If you configure your shipping rates that way and then install our app, the app will show your shipping rates and delivery estimates in your shopping cart page.