After you install & activate this addon, you can set the launch date.
Go to your website's dashboard/system/seo/noindex_before_launch
By default, the lauch date is set one month after the addon activation date.
When you activate this addon, you can see the index status in your admin bar.
* When the admin bar says "Indexed', it means that the sitewide setting is indexed. Some pages might be noindexed, by setting the page-specifice index status.