The Supreme Court isn't going to hear Texas's suit. They've already strongly signaled that by rejecting the Pennsylvania suit without any dissents; Texas is basically trying to sue Pennsylvania for the same things, again.
Edit: SCOTUS declined to hear that case, possibly in anticipation of hearing the Texas one instead, possibly because they intend to hear neither.
Here's the direct PDF link: https://www.supremecourt.gov/orders/courtorders/120820zr_bq7...