Point Judith Ferry - Late August Parking

I’ve seen a few posts about the parking situation at Point Judith Ferry but none are super recent — so I must ask again: how quickly does the parking lot fill up? I have a ferry booked for 11:10 AM on Thursday 8/20 and am coming from MA, so was thinking I’d get there around 9:30ish.

In addition to my Q about how fast you think it might fill up, I’m wondering if anyone’s had success booking with Spot Hero and what parking lots are best to try first?

THANK YOUUUU I’m a first timer!!!