Wow, this just released about a month ago...
The PCI ID is listing as if it is a 7600 series card, probably due to that being the highest available recognition.
I do not recommend trying to install the amdgpu-install through the Software Store. It is unlikely to provide the driver considering your card is so new.
I would recommend instead installing the Latest Linux Kernel. To do so, you must disable Secure Boot in the BIOS Settings, because Microsoft has not signed off on the latest Mainline Kernels.