Donna, my plan was to not travel at night. My boat should go about the same speed as yours. According to Active Captain, it's something like 55 miles to Delaware City. I'll have to check the tidal flow through the canal; my hope would be to catch it as it was flowing out toward the Delaware.
Don't worry about the C&D current, it is what it is. You will get to either Delaware City or Reedy to set up the next day. First day of your trip will be the longest. 10-12 hours is not that long really. I agree with James about Reedy vs Delaware City. Save you 7 miles or an extra 1.5 hours the next day.
Last time when you I and planned this it was March/ April, with variable weather windows and fronts every 3 days. Delaware City was a good stop off point and protected. This time of year, predictable weather, no fronts, save the expense. I would opt for the one night anchor out at Reedy. Your anchor is fine, its good holding, protected from tanker wakes. It will be cooler Also.
Just as a frame of reference, we have done this over 15-20 times in our boat. The trick going to CApe May is to set yourself up for t he least time As possible on the Delaware River. Their are no real bailouts except for the Cohannesey. Get the Canal out of the way so you not have to deal with it the next day to Cape May, even if it means not hitting the Canal at optimal current times.
Also remember current does not equal tide. You need to concern yourself with current, not tide. They are related to an extent, but current is the important factor for you.