Display Remaining Stock Quantity on Products

<?php
if ( ! class_exists( 'WooCommerce' ) ) {
    return;
}

add_filter( 'woocommerce_get_availability_text', 'scseed_display_stock_qty', 10, 2 );
function scseed_display_stock_qty( $text, $product ) {
    if ( ! $product->managing_stock() || ! $product->is_in_stock() ) {
        return $text;
    }

    $qty = $product->get_stock_quantity();
    if ( null === $qty ) {
        return $text;
    }

    return sprintf(
        /* translators: %d: number of items remaining */
        _n( 'Only %d left in stock — order soon.', '%d in stock.', $qty, 'woocommerce' ),
        $qty
    );
}