How are you going to know which way the winds are blowing? No data is
published outside of total votes cast per day during early voting.
Texas has a 50% + 1 requirement to win the primary. Thus in this primary
Cornyn needs to win that amount from among all votes cast for the eight
candidates.
Sometime later today the SOS will publish a listing of the 15 largest counties showing
their total early votes, both in person & mail. The listing will be updated each day.
Example from 2012 primary:
http://www.sos.state.tx.us/elections/earlyvoting/2012/may25rep.shtml