Thank you Simon for your help.
1. This seems like a needlessly risky solution to something I'm not sure is really a problem. I don't know if these workflow reports would be useful to me.
2. NintexWorkflowHistory = 2891; WorkflowProgress = 7,629,003
3. Also needlessly risky and I don't know what script to reference.
I was only looking for an easy solution since we are beginning our project to upgrade to SP 2019.