I am pretty sure he will not release it during the american tour dates. And I'm more sure he will not do it before, because that should have been announced already.
So earliest date would be somewhere end of October.
But more logic to me would be end of November. The full moon releases of the album would been through, the album could come out and end of December we would get What Lies Ahead as a non album track for the last full moon of 2023.