Hi again, @donnamac!
That is a great question. The future publishing feature is currently only applicable to products on the 'Online Store' sales channel. For other sales channels such as the Point of Sales (POS), Facebook, Instagram, Google Shopping, etc., the products will always be visible/published once the product is created in the admin.
Although at this moment, this feature is only available to the 'Online Store' sales channel, I understand how it can be useful to integrate into other online sales channels as well. I would be happy to also add your vote to the existing ballot our developers review so that they know there is further interest in getting it added. Hopefully, this will be something we can see released in the near future!
Let me know if you have any follow-up questions, or feel free to contact our 24/7 support.