be done and dusted

US /bi dʌn ænd ˈdʌstɪd/
UK /bi dʌn ænd ˈdʌstɪd/
"be done and dusted" picture
1.

to be completely finished or successfully completed

:
Once this report is submitted, the whole project will be done and dusted.
Let's get this task done and dusted before lunch.