{% comment %} Add this snippet to your theme's cart.liquid file before <form></form> {% endcomment %}
<div class="cart-alert">
  <h5>
  {% if cart.total_price < 4900 %}
    <span style="font-weight: 900; color: #9fa615;">Have your eye on anything else?</span> If you spend {{ 4900 | minus: cart.total_price | money }} more, you qualify for free U.S. shipping!
  {% else %}
    <span style="font-weight: 900; color: #9fa615;">Hooray!</span> Your order qualifies for free U.S. shipping! Enjoy the savings.
  {% endif %}
  </h5>
</div>