I have some information about the ability for quotes to show when it has been sent, Onecap.
For now, being able to show quotes of when it has been sent out to customers is unavailable. You'll want to consider using a third-party application. Here's how:
Go to Apps.
Click Finds Apps.
Type estimate in the Search for an app field.
You'll only have to make sure to check its reviews and ratings to ensure you're choosing the right one for your business.