There are 18 days of early voting in Texas this year. It runs from October 13th thru October 30th.
On the first day of early voting, 541,862 people voted in person. An additional 365,192 mail ballots have been received. Combined, that makes a total of 907,054 voters who have already cast their ballot this year -- about 5.36% of the state's 16,914,438 registered voters.
The numbers are from the office of the Texas Secretary of State.