I have a trip from NYC to Maine on July 6. Did Elon say something about more superchargers would be running by the end of this month? Wondering if there's a chance that'll help my trip
There won't be enough to help you by then. Look at Tesla's page:
Move the slider under the map; you probably won't get the Supercharger coverage you'd like until the fall at the earliest.
Unlikely that soon. But you might get lucky.
I found mention of one in Sturbridge MA, as a possible future. That placement would be perfect. I suppose I could call Tesla to see if they'll hurry it up to make my trip more convenient. (Kidding)