wp_get_schedule

function wp_get_schedule( $hook, $args = array() ) {
	$schedule = false;
	$event    = wp_get_scheduled_event( $hook, $args );

	if ( $event ) {
		$schedule = $event->schedule;
	}

	/**
	 * Filter the schedule for a hook.
	 *
	 * @since 5.1.0
	 *
	 * @param string|bool $schedule Schedule for the hook. False if not found.
	 * @param string      $hook     Action hook to execute when cron is run.
	 * @param array       $args     Optional. Arguments to pass to the hook's callback function.
	 */
	return apply_filters( 'get_schedule', $schedule, $hook, $args );
}