My peeps from the National Weather Service have provided the following sites to check cloud cover.
From Harold Brooks:
At this point, the low clouds are forecast only over the Texas part of the path. Arkansas/SE OK are only high cloud. Tomer Burg’s cloud cover stuff is probably the best, easily available forecast out there. 2024 Eclipse Forecasts
The other one is pivotal weather. Eclipse 2024 Cloud and Visibility Watch — Pivotal Weather
I suspect heading to Carbondale, Illinois or Indiana or points farthest NE like Burlington, VT would be best…