I can share some information regarding using ton and cube meters in QuickBooks Online. The option to enter or put a unit of measurement for inventory items in QuickBooks Online is currently unavailable.
I'd encourage you to visit our QuickBooks Blog, so you'll be updated with our latest news and updates including product improvements. Just go to https://quickbooks.intuit.com/blog/.
You might find these articles helpful. These resources will help you with managing your inventory and non-inventory items as well as what reports you can pull up to check their statuses: