In 2018, about 8,371,255 people voted in that election (both early and on Election Day). With early voting totaling 5.4 million this year, it seems obvious that total voting in this election will easily eclipse the total voting in 2018. A new record will be set for a midterm election.
We'll have to wait to see which party will benefit from this.
The numbers are from the office of the Texas Secretary of State.