I have heard it both ways but do not know If Texas can go ahead...I sincerely hope they will.
From the link I had posted above.. Appears they are awaiting an answer from the SCOTUS for either a stay or a rejection of the appeal. All they have to do is hold out until midnight Texas time and they in effect have granted additional time as the execution date process has to begin all over.
-——Prison officials moved Jose Ernesto Medellin from his death row cell to another just steps from Texas’ death chamber Monday.
But prison officials were still waiting for the final go-ahead from the U.S. Supreme Court as the scheduled 6 p.m. execution time passed.———— end snip