If my data is like this :
| Deliverable | 
Status | 
| Task 1 | 
Completed | 
| Task 2 | 
Completed | 
| Task 3 | 
Completed | 
| Task 4 | 
InProgress | 
| Task 5 | 
InProgress | 
 
I want to calculate the percentage of 'Completed' Status.  And the output should look like below in Tableau : 
Completed: 60%