Display quantity on product listing

Hi,

I will have to test this, but generally, this should get you product quantities from the plugin:

$product_id = $product->get_id();
$default    = 1;
$min_qty    = alg_wc_pq()->core->get_product_qty_min_max( $product_id, $default, 'min' );
$max_qty    = alg_wc_pq()->core->get_product_qty_min_max( $product_id, $default, 'max' );
$qty_step   = alg_wc_pq()->core->get_product_qty_step( $product_id, $default );

Also – have you considered just replacing product’s add to cart form on archives with form from the single product page (in this case I believe you won’t need to add the code you’ve posted):

remove_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 10 );
add_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_single_add_to_cart', 10 );

Please let me know if this doesn’t help.