According to the WSJ, Biden leads Trump in NV by less than 12k with 24 percent of the vote there remaining to be counted. That's a pretty small margin with a lot of votes left to count. Since the last update from NV on Tuesday night, Trump has narrowed the gap. The key is where does that remaining 24 percent come from? Which way do those voters lean?
Also according to the WSJ, GA has counted 99 percent of their votes, and Trump leads Biden by 13k votes. Like NV, that's a very slim margin, but presumably there are only a few votes left to count. But there could be enough Biden votes in that remaining 1 percent to win it for Biden. As I said, 13k votes is very slim.
I think PA and NC are safe for Trump. No hard evidence. Trump has a sizable lead in PA (100k, I think), and has a good cushion in NC (80k, I think) and most of their votes are counted.
One thing to note that if we were to call the election right now, at this moment, Biden would pick up the 6 votes from NV, giving him the 270 he needs - barely. That would make that 1 vote he got from NE the decider. I guess you could argue that that was offset by the 1 vote Trump got from Maine, but geez, that would still be a quirk of the electoral college system.