In general, some states have laws requiring employers to notify employees of monitoring. Very few do this. Many states have no such laws. Check the employee handbook to see if there is any notice of monitoring. If so, you likely have no recourse. If not, you may still have no recourse.
A Texas attorney can give more information as to whether Texas adopted any statutes. There are none that I am aware of.
[This communication is intended as general information and not specific legal advice, and this communication does not create an attorney-client relationship.]