I listened to a video of Clarence Thomas visiting some college recently. He said they do a lot of research prior to the oral argument & mostly have made up their minds about the issue. It’s possible that oral arguments can change their perspective, but only rarely.
We’ve had enough bad decisions out of SCOTUS that I haven’t got my hopes up.
I was at a dinner once where Scalia told us the same thing. The question was, “What was the most persuasive oral argument you’ve ever heard?”. Scalia’s answer, “I’ve never heard a persuasive oral argument.”
Later on, I was a law clerk for an appellate judge. I can certainly say that I’ve never seen a judge change his mind after oral arguments. More than once, I had already drafted the judge’s opinion.