I found this kind of fascinating. Here is the SPY shown with its 30-day IV rank. This relative rank of volatility went roaring higher late in February, and it kept banging up around the 100 level for the first half of March. Naturally, since then, it has plunged back down to nearly 0, since Powell is Large and In Charge.
What the price cone feature in SlopeCharts illustrates beautifully, however, is that while IV rank has been getting lower (hence, the cone changing colors until it goes green), the price people are paying for uncertainty is still gargantuan. Quite a sea-change from what we saw at the start of this animation!