I would say leave no later than 1:30 or 2PM. You will mostly be going against traffic but it will be busy.........did you want to consider the train??
Usually during the week the hov lane takes away a lane inbound on the expressway, which causes havoc in that direction. On labor day there will be no hov lane so two o'clock looks good to leave Newport.
Thanks everyone - We will probably leave around 2 PM.