Time of arrival depends on the tidal cycle. 1000 at Worton is nice. Three days earlier it's an early start from the anchorage there but arrive at twilight.
All of which is moot since from data on the SSCA Forum
the OP has a Gozzard 41 which won't fit under the fixed bridge in the Cape May canal. Cape Henlopen is the way to go.
With respect to following the channel, if you are doing a good job of staying in a fair current staying in the channel helps substantially in getting the most boost, especially off the power plant where the current is about the highest in the Delaware.