There's a few products that can quote unquote be used up to the day of chop, but IMO that's up to each persons comfort level when it comes to using oil based products in flower.
I'm going to treat it with Lost Coast Plant Therapy; it's soybean oil, peppermint oil, citric acid, and isopropyl alcohol. Nothing too crazy there, and it will stop the PM on the leaves. It's only 1-2 plants that are showing, but once it gets advanced there's not much you can do when it gets in the bud itself.
I could have been a bit more proactive with my spraying as well.