Emei has arrived.
Of course Emei would come. In Xuanmen, where karma weighs heavily, Emei, as the leader of the righteous path and the foremost of the nine great Xuanmen, must wrap things up properly before its transition. For instance, the entrusted heavenly books must be returned, industries like the peach orchards must be transferred, secrets and important matters at Cloud Platform Peak must be understood, and arrangements must be made for disciples who do not wish or are not able to ascend with the sect into immortality, remaining in the mortal realm.
Moreover, Emei's complete sect ascension is not a past action but an ongoing process.
After all, this Feather Transformation into the Flying Immortals isn't just a snap, and you're gone; that wouldn't be called ascension, it would be called perishing into dust.