Is it waiting to go to Galveston or Freeport do you suppose?
It is too big to dock at either as I understand. It was going to lighter (use smaller ships to shuttle between dock and tanker) at Galveston but LyondellBasell canceled their delivery. It is believed there is no buyers at this time due to the controversy of the ownership.
Reported draught for this load is 53.5 feet deep.
https://www.marinetraffic.com/en/ais/details/ships/538005501/vessel:UNITED_KALAVRVTA
Galveston maintains a minimum channel depth of 45 feet, same as Freeport.
http://www.portofgalveston.com/index.aspx?nid=135
http://www.portsamerica.com/portoffreeport-texas.html