During this Covid situation, do we have to schedule tickets in advance or can you still buy the tickets as soon as we get there?

There are two exhibits that you have to pay additional to access. Those are timed entry so they can monitor how many people are in there. IMAX movie seating is very spaced out as well

I recomend. you buy the tickets online so you can pick the best time that fits.

You can still buy tickets there. There's a shield between you and the cashier, and plenty of hand sanitizer.