It may shift more rapidly after the nomination but its shifting steady right now.
Go Trump!
Not to mention that its way early. IIRC the early polls had Reagan down by double digits in ‘80, and Dukakis beating Bush I in ‘88 by almost 20 points in the early going. One of the warmest feelings I can remember was watching John Chancellor on NBC election night coverage saying over and over again as the Reagan landslide built, “Nobody predicted this kind of victory for Ronald Reagan.” I know that Trump isn’t Reagan, but the obverse is also true, Trump isn’t going to take any crap from Hillary or the ‘Rats.