Show shipping costs on cart page

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Good evening, on my shopify site I have the opportunity to allow the customer to calculate the shipping costs from his cart page. The fact is that I would like to eliminate that "calculate shipping" option and insert the actual cost in its place, ie what would come out once the function is executed. I would like to do this because the shipping costs of all products on the site are fixed and do not vary according to the place where they will be shipped (the shipping is only for Italy). Is there a way to do this by even touching the theme code? I am attaching a photo to show which part of the cart I would like to delete.