wp_query product category
$args = array(
'post_type' => 'product',
'post_status' => 'publish',
'ignore_sticky_posts' => 1,
'posts_per_page' => '12',
'tax_query' => array(
array(
'taxonomy' => 'product_cat',
'field' => 'term_id', //This is optional, as it defaults to 'term_id'
'terms' => 26,
'operator' => 'IN' // Possible values are 'IN', 'NOT IN', 'AND'.
),
array(
'taxonomy' => 'product_visibility',
'field' => 'slug',
'terms' => 'exclude-from-catalog', // Possibly 'exclude-from-search' too
'operator' => 'NOT IN'
)
)
);
$products = new WP_Query($args);
var_dump($products);