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There are no turboprops flying United livery these days (nor Delta nor American); the ERJ135, ERJ140, and ERJ145 are all regional jets, not turboprops. That said, the smaller RJs can use the hardstand that was used for turboprop flights, accessed via the C130n "virtual" gates (V–Z). Most of United's current operation in Terminal A is regional jets as well.
If you land at C130n, you will deplane down stairs to the tarmac, pick up any gate-checked (i.e. green-tagged) bags, and board a bus. Once all passengers have deplaned and boarded the bus, it will drive you back to the terminal, where you will climb a staircase onto the airbridge for gate C71 (near the inter-terminal shuttle) or C130.
If you arrive at Terminal A, the larger jets (e.g. E170) will deplane onto a Jetway just as a mainline flight would. For the smaller RJs you may take stairs down to the tarmac, retrieve your gate-checked bags, and then walk to the staircase to the airbridge, but I have not done this transfer myself at terminal A in some time.
Arrivals are calculated from the time the bus arrives at the gate, so you may expect the schedule to be slightly padded if the normal operation is to a remote stand. From anecdotal reports at FlyerTalk, the time to transfer from a C130n arrival to another C departure is comparable for an A terminal arrival to a C departure, using the A-C airside shuttle.