Here's the outflow boundary (circled in blue) from looking at the Old Hickory radar at the NWS office on the weatherunderground radar. I circled the red around the storms that have fired due to the outflow boundary. We should expect more storms to fire as this boundary moves southeastward.
UPDATE: The outflow boundary passed the Highland Rim Station at around 8:50 this morning. It brought with it some noticeable wind and GREAT looking clouds. I don't know what clouds they where, but they looked "bumpy" which gives me an idea that they may have been Mammatus clouds, but am still unsure. I hope we see more action later on when the storms fire during the heat of the day.