Just checked weather.com and the outlook is that it will be 60 degrees, with a 30 percent chance of showers at 6 p.m. Same forecast for 7 p.m. Post time is 6:42 p.m.
Right now, at 11:45 a.m., the track is still listed as sloppy. The turf course is listed as good. The sun isn’t out right now, so I don’t see much chance that the track is going to dry out. The cooler tempartures won’t help in that regard, either. But at lesat it’s not raining.

I’ve been following the derby ever year since 77, and it seems like the post time continues to get later and later. Hopefully they’ll stop before we get to midnight.
With Churchill putting in lights for night racing, we may be headed toward a prime-time post-time.