The pound is "shooting up" only in the sense that it's recovering the losses that it accrued whilst it looked like Johnson was in control. Then he lost his majority, the government was in chaos, etc -- and *then* the pound recovered. To link that to anything Johnson has said, or done, is manifestly mistaken.
Now, if Johnson were to announce that he had succeeded in negotiating a new deal, that picture will change (supposing Parliament supports it). But until then the pound is on the up in spite of Johnson's efforts, rather than because of them.
Supreme Court won't dismiss the proroguing challenge on Tuesday, I don't think, because it's only scheduled to hear oral arguments that day (and also Wednesday and Thursday). I think we'd have to wait until the week after for a verdict. I would expect that verdict to go the government's way, mind -- although it's disappointed to see it called a "nonsense" challenge. The High Court ruling in London kept pointing out many of the flaws in defending the prorogation (eg, "only a few sitting days lost" -- not true) even as it upheld its lawfulness; and, taking the High Court's ruling at face value, it seems that future PMs would have full licence to prorogue Parliament for months at a time, which would mark an unwelcome return of the days when England was effectively ruled by a dictator king or dictator Protector.