Republicans now control 69% of the state legislative chambers held, increasing from 57 to 68.
Republicans continue with 23 trifectas, but Democrats lost more than half, going from 15 to 7. (There is still 1 undecided because of Alaska).
Governorships increased from 28 to 31 with Republicans now controlling 62% of governorships though that could increase to 64% if Alaska falls Republican.
Republicans are expected to gain 300 to 350 seats, and will have their highest total of state legislative seats since 1920, though I think it would be more fair to not compare the actual numbers but the percentages.
(Some of these numbers vary a little depending upon the source).