Hi - my old z390 was the same as yours apart from the form factor and CPU but this EFI Folder should get you up and running. Clean your NvRAM and try it, I use a formulated SSDT file (as shown) and an entry in the config.plist to map the USB Ports instead of a kext file, if you have any problem with the USB Ports just delete the entry in the config.plist remove the SSDT from the folder and use USBInjectAll.kext instead until you properly map your ports.
Hopefully the attached EFI Folder and pics will get you started, all files are updated to the latest so you should be good to go. Good luck.