I'm looking for a Drupal Commerce Shipping in-cart estimate I am working on a Drupal Commerce site, we are trying to add a feature in the cart that would allow the user to input their zip/postal code or country and receive an estimate on shipping, before proceeding through the checkout. I'm new to Drupal Commerce, so maybe this functionality already exists? 

a shove in the right direction would be greatly appreciated. Thanks.
link- https://drupal.org/project/commerce_shipping
Commerce Shipping provides a shipping rate calculation
system for Drupal Commerce , integrating shipping
service selection into both the checkout form and order
edit form. This module is a framework that is meant to
be used in conjunction with shipping method modules
like Commerce Flat Rate , Commerce UPS , and others.
Shipping service availability and rate calculation is
handled in the user interface through Rules and is
backed up by an API that gives you a high level of
flexibility to implement simple or complex shipping
scenarios.