Anyone know if the Samsung S9+ model G965W is supported?
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Because this has been moved to a suggested device I will assume the G965W is not supported at this time. I also fond information it has a different chipset than the G965F (supported unit), so it not a “simple task”, but yes it would be nice to have support for the NA units 
Those phones can’t be supported due to technical limitations which are there because of the already mentioned different chipset.
Some NA users bought the EU version of the devices. There’s also a number of supported chinese phones which you should be able to get.
Or the FairPhone if it’s sold in the states.
Using the search function of this forum should get you some threads with interesting informations.