Set all products as virtual

add_action( 'init', 'set_virtual' );
function set_virtual(){


    $args = array( 
        'post_type' => 'product',
        'posts_per_page' => -1
        );
    $products = new WP_Query( $args );
    var_dump(count($products->posts));
    foreach( $products->posts as $item ){

        update_post_meta( $item->ID, '_virtual', 'yes' );

    }

}