How to indicate which flow step leads are currently in

I am also interested in a simple way to view this. 

The workaround if there is not an out of the box solution is having a field that is updated based on what step they are at in your workflow. E.g. before your second wait step you could update a data value on a custom field called "Campaign Step" with a value of "Wait Step 2". Then before sending the email update with "Email 2 Sent" etc. 

Hope that helps. 

I'm with Jeff on this one.

I don't think there's an out of the box solution for this - the smart campaign will tell you how many leads are in a wait step, but not who.

I would probably implement what Jeff suggested. From there, you can go back and see which emails have been delivered to leads and mark them with the appropriate Wait Step value.

Thanks for your suggestions but it seems more like a proactive solution, while I need to do this retroactively as my campaign has been running since October.