NWS issued snowfall maps, below, with a general 4-6" of snow for most and 6-8" for NWNJ/Poconos/Lehigh Valley, starting around sunrise on Thursday and lasting through the evening. In their discussion, they talk a fair amount about a front end thump of snow, followed by a potential mix or changeover to sleet as far NW as the 95 corridor and maybe even inland of that a bit - as we saw for 12/16, that's very difficult to predict, as is the best banding for snow, but with a track just off the coast, the best banding is often in our NW areas, inland of 95. There's also a risk of a changeover to plain rain, especially near/along the coast (and especially south of 195).
The other big question is how much precip do we get? Most models are showing around 1" of liquid equivalent meaning most of the precip would be snow/sleet, at least along and NW of 95, Still 48 hours out from the start of the event, so changes are clearly still possible, which is why it's not worth diving too deeply into the details of the models or the NWS forecast yet. Suffice it to say that the NWS said they'll likely be issuing warnings at 4 pm, unless there is some major shift in the 12Z models coming out shortly. And FYI, the 12Z NAM just came out and backed off the insane 2"+ of precip from last night with 1-1.5" of precip and almost all of it frozen along and NW of 95 (i.e., (6-12" of snow/sleet with a bit of freezing rain at the end, early Friday) - closer to the other models last night (which are more like 4-8" snow/sleet for most).
https://www.weather.gov/phi/