From my experience every vote is counted. Rhey know the count of absentee ballots and if that number would make a difference.
I think you are right. Here is the Florida count for early voting and VBM/absentee voting, in it they include absentee voting:
Numbers released Monday morning by the state’s Division of Elections show a total of over 5.1 million people had either taken part in early voting or had mailed in their absentee ballots. Another 1.1 million absentee ballots that were requested had not been submitted as of this weekend.
Nearly 13.2 million people are registered to vote in the state of Florida according to the Division of Elections as of September 30th.
Democrats have cast 2.06 million ballots. Republicans have cast 2.04 million. More than 948,000 voters with no party affiliation have also voted.
This year’s totals far exceed those of 2014 midterms, but are still short of the 6.6 million who voted ahead of Election Day in 2016.