What comes before Alpha and after Omega? When there WAS, IS, and ALWAYS WILL BE, only 'The Great I Am'; your question serves no purpose, other than to presume a premise that is not needed. God IS!(Now, of course, there are some who have trouble with what the definition of 'is' is.)
As Dr. Johnson says, and as I, and some others 'choose' to believe, "In the beginning, there was the Word...."
And so is the universe. It always was and always will be.