Easy Profile - Joomla Extension

I have been successfully using skeleton.php since I knew if its existence, but for the first time I find myself needed a process that fires on the creation of a new account.

I need to write the users ID to a third party table, but when a new account is created, the user does not have an ID

Am I using this piece of code correctly (this is an example) or is it not possible for skeleton.php to get the user id of a newly created user at the time of registration submission? I can work around this with a two step registration process but would rather just have one for user experience

I have tried both $data['id'] and $user->id;

		if ($isNew) {



			// Get a db connection.

			$db = JFactory::getDbo();



			// Create a new query object.

			$query = $db->getQuery(true);



			$columns = array ('created_by', 'approved', 'published');

			$values = array ( $data['id'], '0', '1');



			$query

				->insert($db->quoteName('#__my_table'))

				->columns($db->quoteName($columns))

				->values(implode(',', $values));



			$db->setQuery($query);



			$db->execute();

            }

If this is incorrect, how can I use skeleton.php to grab the id from a newly generate user account so I can use it immediately? or does skeleton.php fire before the account is saved so there is no id?

If the account has been created I suppose I could use

$db->execute();

return $db->insertid();

in skeleton.php to grab the ID

Any guidance appreciated