The state legislative chambers where R's are poised to have a net gain in right now:

AR Senate, IN House, OH House, OK Senate, SD Senate, WY Senate, OR Senate, WA Senate, WI Senate, KY House, OK House, WY House, CA Assembly, MT House, ME House, possibly WV House (MMD chamber)

The chambers where D's are poised to have a net gain in right now:

ID House, CO House, NM House, TX House, KS House, MO House, IL House, IA House, WI Assembly, MN House, MI House, FL House, GA House, NC House, TN House, PA House, CT House, VT House, MA House, NY Assembly...

NH House, AZ Senate, CO Senate, CA Senate, MT Senate, ND Senate, NE Unicameral, KS Senate, TX Senate, NC Senate, TN Senate, MN Senate, IA Senate, IL Senate, IN Senate, OH Senate, PA Senate, NY Senate, CT Senate, NH Senate, ME Senate

As you can see from this thread, Democrats are doing pretty well in most of their fights for control for state legislatures. Keep in mind that there are still Toss-Ups to be eliminated in most of these chambers, which can affect the projected net gain. https://cnalysis.com/forecasts/2020-state-legislative-ratings