Nate Silver just tweeted he is not a decision desk but he deems Nevada "callable" at this point as he sees no path for Trump to win.
This would push Biden to 270 among the news agencies that have called AZ for him (Fox, AP, Economist, et al). We would be in a weird scenario and have to see what other networks do if Fox News is actively calling Joe Biden the President Elect in a few hours and they are not.