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Ya lo solucioné...

Agregue este código a /themes/theme1521/templates/catalog/_partials/miniatures/product.tpl

<div class="product-detail-wrap">

            {block name='product_availability'}

              <span id="product-availability">

              {if $product.show_availability && $product.availability_message}

                <span class="{if $product.availability == 'available'}product-available{elseif $product.availability == 'last_remaining_items'}product-last-items{else}product-unavailable{/if}">

                  {if $product.availability == 'available'}<i class="fa fa-check"></i>{/if}<span>{$product.availability_message}</span>

                </span>

              {/if}

            </span>

            {/block}

           
          </div>