Cleaner::getProgressInfo

static function getProgressInfo(int $ownerId): ?array
{
	$optionSerialized = MainConfigOption::get(
		self::STEPPER_OPTION_ID,
		self::className(). $ownerId,
		''
	);
	if (!empty($optionSerialized))
	{
		return unserialize($optionSerialized, ['allowed_classes' => false]);
	}

	return null;
}