product featured tax
$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'product_visibility', 'terms' => 'featured', 'operator' => 'IN', ), );
$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'product_visibility', 'terms' => 'featured', 'operator' => 'IN', ), );