You may have requested a publish date in the future. Remember to select Publish right now if you don't wish to delay the approval process.
Your product is 'unpublished’ in the inventory. This will be indicated by a red exclamation mark in the product list. You can adjust this setting by going into the Inventory & variations tab and clicking on the little ‘red eye’ to the left of the inventory table. This will change the 'red eye' into a ‘green eye’.