Work booked me a flight through LGA that comes in on Delta Connection metal (Terminal C) and leaves on United metal (Terminal B) -- I have 1:40 connection, which I assume (hope) should be fine on a Sunday afternoon even between terminals.

IIRC, there was no airside transfer between C + B as of ~5 years ago -- is that still the case even after the upgrades?

Assuming I have to go landside and go back through security (luckily I'm TSAPre with carryon, which should help), what is the fastest way to get from C to B to make the connection? Assuming my inbound is on time, 1:40 is plenty of time, right?