add noindex nofollow to category archive

add_filter('wp_robots', 'add_noindex_nofollow_to_category_archive');
function add_noindex_nofollow_to_category_archive($robots) {
    if (is_category()) {
        unset($robots['max-image-preview']);
        $robots['noindex'] = true;
        $robots['nofollow'] = true;
    }

    return $robots;
}