Looking deeper into this I found that surprisingly Intel 13th and 14th Gen (Raptor Lake architecture) CPU’s don’t have this vulnerability though they share the same prefetcher as Apple’s M chips.
I don’t think it is quite that serious at the moment as it has only be done in a lab under some pretty controlled circumstances and the thing need lots of crypto operations to work. I’m pretty sure they are doing analysis on it and will say something when they know what to say.