I arrived about 40 minutes early, and they actually started my interview almost half an hour ahead of schedule. Everything went very smoothly. The civics questions focused on the Constitution and U.S. history, and the reading and writing portions were simple—though the electronic tablet and thick stylus were a bit awkward. (My advice: get comfortable using a tablet beforehand, or try practicing with a thick pen or a highlighter on a small notepad (10 inches) to simulate the experience.)
The interview itself was quick and straightforward. Now, I'm just waiting for my Oath Ceremony to be scheduled—really looking forward to it!
Big thanks to everyone, especially @OldUser. Wishing everyone else a smooth and successful interview as well!