What does pending and scheduled refer to?

Pending: Pending will turn to scheduled within 24 hours of book promotion from the date created. 

Scheduled: Scheduled will turn to published once it is live on the websites.

Scheduled: (Crave Books Tweet): Scheduled will be shown on the date of the start of a tweet on our Twitter pages. 

Publish: (Crave Books Tweet): Publish will be done after the last tweet is done on the pages.