I am running OCR through workflow and DP now so that I can take advantage of more cores. However I can't seem to find a way for workflow to communicate with the DP engine. I have checked in the Schedule OCR settings and checked for a wait condition that detects text on a document.
How does workflow know when a document OCR is complete?
The way that the activity works is that Workflow schedules the document to be OCRed, but that is all that it does. There is no wait condition for it and the DP does not report back to Workflow.
If you did want to somehow have them talk to one another I would have workflow add a field of "Pending OCR" and wait. Then have another workflow setup with starting rules of entry changed, page count, and having the "Pending OCR" field. In that workflow retrieve text, make sure the pages are there, and update the "Pending OCR" field to move the other workflow forward.