Cal here from Shopify, thanks for reaching out to us.
While the checkout process cannot be changed on the platform, as our checkout is not open to coding for security purposes, you can install an app like Estimated Shipping Cost or Shipping Rates Calculator which will display an approximate shipping cost based on your customers' IP address. These apps will give you the functionality you're looking for in allowing customers to preview their shipping cost prior to submitting their details through the checkout.
I hope this helps!
Cal | Social Care @ Shopify
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