You won't be able to find it under finish_code. But for progress field, search for anything not equal to (!=) 100.
Yes, progress field does give the information about it.
But again looking forward most of the times it will be 0 or 100.
Do you have any idea?
One reasoning for this is could be because Tableau Server doesn't know the exact new size of the new extract so it can't place a progress percentage on it. Other factors come into play during extract refreshes as well such as network latency and system performance so it may be hard to base progress on extract size alone.
Thanks a lot for the detailed explaination