Submitted digitally and received receipt confirmation in early November for 10.7.17 ride. Should I be concerned?
No. As mentioned, for the regular members, the processing time is at least two to three months - and you also had the holiday period in the mix, where things slowed down.
I wouldn't expect anything until mid-February at the earliest. I have no insight into the process, but the timelines are fairly established. The verification team does an outstanding job in doing what they do.