According to Jason Holbert on Facebook: “It’s surprisingly good. I biked the entire thing Monday-Tuesday this week, Humboldt included. It’s not even soft. Saw several guys from KDWP working on it, too.”
In general, immediately after a rain (or a snow melt), the trail is going to be soft, and bike tires will create ruts. After a day or so of sun and/or wind, the surface firms up very quickly. It hasn’t rained much in a while, so it should be good to go!