Just bumping this for you - I live on the eastern side of MD, so have no insight, but I knew anyone that did would need to understand where you are coming from. I can take a wild guess and say that from your location on a general Saturday morning you probably won't have much traffic impacts at all.
(When I Google it the recommended route shows 1 hour, 17 minutes, with the majority of your time on 7 it looks like.)