See what you can do with a proof approval report. You may not be able to get clean %s like you're after but you can at least filter in all proofs from X timeframe and add a column for proof progress to see if it was sent, sent > opened, etc. I tried to see if you could group it by progress for a chart by progress but not happening bc there are multiple possibilities for the proof progress.
![Madalyn_Destafney_0-1701192180073.png Madalyn_Destafney_0-1701192180073.png](https://experienceleaguecommunities.adobe.com/t5/image/serverpage/image-id/66614i78A7CCDC83231C55/image-size/medium?v=v2&px=400)
You can sort the report by this column to split out sent vs. sent and opened and other progress stages and deduce a percent that way to see # of certain stages vs. # of proofs you're pulling in.
![Madalyn_Destafney_1-1701192324507.png Madalyn_Destafney_1-1701192324507.png](https://experienceleaguecommunities.adobe.com/t5/image/serverpage/image-id/66616i53A54DA0A1B3DA6A/image-size/medium?v=v2&px=400)
If this helped you, please mark correct to help others : )