If you need to get an overview of your landing pages, hover your mouse over the Growth Tools tab on the top navigation bar and select Landing Pages.
On your Landing Pages overview you can find information for each landing page you have created. The fifth column of this table indicates the status of each landing page. There are a few different statuses that you might come across:
The above terms are mostly self-explanatory - for example, the Published status obviously designates a landing page that has been published. Clicking on the above links will give you as much information as you might need for each status, including some details which you might deem useful.