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PC §46.03. PLACES WEAPONS PROHIBITED. (a) A person commits
an offense if the person intentionally, knowingly, or recklessly possesses or goes with a firearm, illegal knife, club, or prohibited weaponlisted in Section 46.05(a):
(1) on the physical premises of a school or educational institution,
any grounds or building on which an activity sponsored by a school or
educational institution is being conducted, or a passenger transportation
vehicle of a school or educational institution, whether the school or
educational institution is public or private, unless pursuant to written
regulations or written authorization of the institution

PC §46.035. UNLAWFUL CARRYING OF HANDGUN BY LICENSE
HOLDER. (a) A license holder commits an offense if the license
holder carries a handgun on or about the license holder's person
under the authority of Subchapter H, Chapter 411, Government Code,
and intentionally fails to conceal the handgun.
.
.
(2) on the premises where a high school, collegiate, or professional
sporting event or interscholastic event is taking place, unless
the license holder is a participant in the event and a handgun is used
in the event;

"Premises" means a building or a portion of a building. The
term does not include any public or private driveway, street, sidewalk
or walkway, parking lot, parking garage, or other parking area.

The premise is defined as building. You are not in the building, and there is not school activity going on so you are legal to carry. Ill find the verbiage and post it.