Billing usage and a streamlined invoice are now available.
Billing Usage: real-time resource usage information is now available in Project → Usage → Billing. From there, you will find detailed information about each resource, when it was added to your account, and the cost accrued. The page also shows when your next invoice is due.
Preview upcoming invoices: When you go to Settings & Billing → Billing, you will find a list of all your projects, their current usage, and the date each project will be invoiced.
Invoice improvements: If you had servers that belonged to the same plan, your invoices would group these servers into a single line item. For improved visibility, each server now has its own line item in the invoice. This lets you see detailed usage for each compute resource right from invoices.