There’s currently no ARM-native support for Dorico on Windows. I believe these devices can run x86 software under emulation/translation (like Rosetta 2 on macOS) but I don’t know what the performance is like.
I believe my colleagues in Hamburg have access to at least some ARM-based Windows devices, though I’m not sure whether the latest Surface Laptop is among them. We don’t have direct access to any such devices in the Dorico team itself, so we’ve not done any testing on these configurations.
As ARM SoCs become more prevalent in Windows devices, I expect we will add native ARM support, but there’s quite a lot involved in achieving that: not only Dorico itself, but also its audio engine (which is of course based on Cubase, itself a very large and complex application) and the Qt framework all need to be supported on ARM as well, not to mention VST plug-ins, etc.