Based on the rules for assigning delegates, if Cruz does not get at least 50% of the vote he is finished. And thanks to your posting, we can see he is not even close. LOL!
Cruz at 35% and Trump at 20% with some 19% undecided.
Texas allocates the delegates proportionally by Congressional District and Statewide.
3 per each of the 36 CDs, 50%+ gets all, otherwise allocated
47 based upon statewide performance, Majority wins all otherwise allocated
108 CD
047 Statewide
155 Total
It’s a little more detail than outlined above. Click the following link for details.