It's a high end version of the HD 7970/R9-280x with lot's of VRAM, it's very probable that will work, but it's the type of card that you'll need to test to confirm.
I've analysed the macOS 10.13 AMD kexts and FIREPRO W9100 uses Hawaii XT architecture [like the Radeon R9 290X]
Hawaii XT is referenced in AMD8000Controller.kext and AMDRadeonX4000.kext
Like @tsialex suggests - it should work BUT it looks like no-one has ever really tested it/tried it.
Lou seems to have linked to a thread on the fully compatible WX9100 by accident.
Also W8100 can be ruled out - there is no Hawaii PRO GL kext support referenced anywhere in macOS..