Hi there, BruceHBlack.
The CC/BCC feature will only send you a copy of the emails that were sent from QuickBooks. For now, we're not able to send you a receipt once the customer received them.
Though, you can go to the list of invoices under the Sales menu to check if the invoice was already sent or viewed by the customer. Here's how:
For estimates and sales receipts, you will need to open them if you want to check when the transactions were sent to your customers.
I'd be glad to get back here if you have other questions about sending sales forms in QuickBooks.