Displaying incomplete or partial entries
Why does GravityView support Partial Entries but not Save and Continue?
The Partial Entries Add-On stores its data the same way as standard Gravity Forms entries do, making the entries and the values available to GravityView.
How to display "incomplete" entries only
You'll need to use the Advanced Filter extension for that. Then it's just a matter of going to the View Settings panel (inside the View editor page) and set that up:
With the filters, you can specify if the "Progress" - is - "Complete" or - is not - "Complete.