No, we were still working on leaving that world when I was brought here.

[Which isn't the same as "I was going home". Asgore knows he couldn't sell such a direct falsehood. What he's said is true anyway; until they wrapped things up with the Risen, none of them were going to leave.]

But Alex - the girl who brought us there - she was of the belief that time had not stopped while we were in Beacon.