New to the US, need advice on Driving conditions from Charlotte to SC for the eclipse.

Miami Resident here! Flying To Charlotte this week and thinking of driving down to Greenville or Cloumbia for the Eclipse, The Day of. Im new to to the US, so i have no idea what the driving conditions may be. Could anyone tell me if the 1.5 hour drive will become impossible that day (1 million people going to visit apparently) or will i be able to make it if i leave early(say 6-7am 21st august).

Thank in advance!