Collections have three potential statuses - they can be Unpublished, Published, or Scheduled.
Unpublished collections will not be available in your catalog and cannot be seen or purchased by customers.
Published collections are visible to customers. They will be shown in the catalog and will be available for purchase according to the pricing you have set.
Scheduled collections are not published until their scheduled release date. At the scheduled date and time, they will be made available on your storefront. If you enable the notification email, a notification email will be sent to all customers on the publication date.