So far 9.1 million Texans have early voted. In Texas early voting has been incredibly easy for about 10 years. You can go to ALMOST ANY voting precinct in your county and you have 3 weeks. Newer machines use a pen-based scantron.
Right now 19.6 million Texans are registered to vote because you pretty much register when you get an ID. That means 53% of voters did so early. But in 2016 almost 60% of voters turned out. See our population increased by around 2.5 million.
Furthermore, of early votes tabulated so far, 53% are from Registered Republicans. Only 36% are from regisrered Democrats. And we've all seen surveys showing that 6 in 10 election day voters support Trump. Source: https://www.nbcnews.com/politics/2020-elections/texas-results?fbclid=IwAR0KEBlNdW0VVOcGZq2WZbLAk3JmJ_cdSlEUWEblbZWhmY1oXl6TzrMItjo
Our Republican governor won by 12% in 2018. You have to realize Beto got within about 3% because 1) he spent the most money of any senatorial candidate in history and 2) Cruz still had a very low approval rating by Republicans for his criticisms of Trump. In September Cruz only had a 62% favorability from Republicans.
Less than 12% of early voters in Texas so far have also been under 29 years old.