Scheduled Cron Job in wordpress

if (!wp_next_scheduled('my_task_hook')) {

    wp_schedule_event(time(), 'hourly', 'my_task_hook');

} 

add_action('my_task_hook', 'my_task_function');

function my_task_function() {

    wp_mail('nileshyadav326@gmail.com', 'Automatic email', 'Automatic scheduled email from WordPress.');

}