If it was me and I felt ready to run a marathon (and had done a proper build for a race and everything), I would at least run the distance as part of the virtual race! This way you can practice your nutrition plan, pacing strategy, and (likely) finish a full marathon. And then if my goal was to really race a full marathon (in a real race) I would just give some time to recovery and build back up for a spring marathon.

This year I've been a big believer in just having fun and taking advantage of my fitness (since I did the same thing as you and continued building towards races that have now been cancelled). I'll probably eventually call it a season at some point, and transition into winter mode for next year but you may as well use your fitness before that (especially since you obviously can't just stay "race-ready" till the spring... that's just asking to get hurt eventually)