At the Sumter County Supervisor of Elections website, there is a cumulative report showing how many early voters' ballots have been cast on each day of early voting since 10/27. It's in a link on the right, at the link called "Early Voting Totals" under GENERAL ELECTIONS header.
The website header shows there are 74,249 "Active Registered Voters". In the report showing Early Voting Totals so far, thru yesterday November 3, the total early ballots cast number 30,268.
That's a significant reduction in the number who will be at the precinct polling places on Tuesday, and this doesn't count the Absentee ballots cast.
Sumter County -- Supervisor of Elections