Not to steal MSP's thunder but, I think there are two issues here. What you show right now is correct for knowing that you have been put on a SWU waitlist for that flight.

The "incorrectly coded" issue is a little different, although I personally have never had the problem (but a similar one). It concerns the day of the flight.

The other problem people talk about is when you check in, look at the UG list, and find that you are not #1 or near #1. That is when you need to worry, because you have used a SWU but not been coded with a SWU upgrade code. Lists of the codes can be found with and FT search, but the response is the same - you need to call or tweet and get the SWU (not complimentary standard UG) code added to your ticket so that you zip to the top of the list.

My related problem is that the SWU took me off the list completely. A tweet to @DeltaAssist fixed it.

Bottom line, you are OK now, but if not at the top of the UG list after check in, start calling.