functions.php

<?php
/*
 * Add Stock Quantity in Catalog Loop
 */
function odin_stock_catalog() {
    global $product;
    if ( $product->is_in_stock() ) {
        echo '<div class="stock" >' . $product->get_stock_quantity() . __( 'EM ESTOQUE', 'odin' ) . '</div>';
    } else {
        echo '<div class="out-of-stock" >' . __('SEM ESTOQUE', 'odin' ) . '</div>';
    }
}
add_action( 'woocommerce_after_shop_loop_item_title', 'odin_stock_catalog' );