Unfortunately there isn’t one set way of doing this and no general trend.
One of the key factors that will influence it is how long a gap there is between the first and last AC. If this is more than a couple of weeks, it’s more likely to be on a rolling basis.
Firms are pretty good at predicting conversion rates, so I don’t think you are at a disadvantage going later. In addition, 1) firms typically have some flexibility in hiring numbers and 2) even if they do offer on a rolling basis they can also put some candidates on hold while they see how later interviews go.