Regardless of the tornado threat, these storms will have cloud-to-ground lightning and will, in places, have forward speeds of 35+mph. So, they will move in rather quickly.
Using some experimental computer models, here is some information that might be of help for planning purposes. This is the forecast radar for approximately 5-7pm CDT (the models are good with position, less good on timing).
And, here is the forecast from 8 to 10:30pm.
Here are the tornado safety rules for home.
Here are the tornado safety rules for schools.