Basic cronjob

<?php 

// balans
//cron job for checking order statuses (waiting 1 week for labels received)
add_action( 'cron_check_order_status',  'check_order_statuses' );
function activate_cron() {
  if (! wp_next_scheduled ( 'cron_check_order_status' )) {
    wp_schedule_event( time(), 'daily', 'cron_check_order_status' );
  }
}
function deactivate_cron() {
    wp_clear_scheduled_hook('cron_check_order_status');
}
add_action('wp', 'deactivate_cron');

function isWeekend($date) {
    return (date('N', strtotime($date)) >= 6);
}

function check_order_statuses() {

  if(!isWeekend(date('Y-m-d'))) {
    global $wpdb;
    $weekback = date('Y-m-d', time() + (60 * 60 * 24 * -7));

    $querystr = "
      SELECT * FROM $wpdb->posts
      WHERE $wpdb->posts.post_type = 'shop_order'
      AND $wpdb->posts.post_status = 'wc-labels-send'
      AND $wpdb->posts.post_date <= '{$weekback} 23:59:59'
    ";
    $result = $wpdb->get_results($querystr);

    if($result[0]) {
      foreach($result as $order) {
        $myorder = new WC_Order($order->ID);
        $to = $myorder->billing_email;
        $subject = (get_field('title','option') ? get_field('title','option') : 'Herinnering email labels');
        $body = 'He '.$myorder->billing_first_name /*.' '.$myorder->billing_last_name.*/.', <br><br>'.
        (get_field('text','option') ? get_field('text','option') : 'Dit is een herinnering mail omdat u nog niet de order labels heeft bevestigd. Dit kunt u doen via onderstaande link: <br><br>').
        '<a href="'.get_permalink( get_option('woocommerce_myaccount_page_id') ).'">Mijn account</a>';
        $headers = array('Content-Type: text/html; charset=UTF-8');
        $headers[] = 'From: '.get_bloginfo( 'name', 'display' ).' <'.get_bloginfo( 'admin_email', 'display' ).'>';
        $headers[] = 'Cc: '.get_bloginfo( 'admin_email', 'display' );
        wp_mail( $to, $subject, $body, $headers );
        /*require_once( 'includes/class-wc-custom-reminder-email.php' );
      	$emailreminder = new WC_Reminder_Email();
        $emailreminder->trigger($order->ID);*/
      }
    }
  }
}