You can see the amount of work that has been done to the exterior of the building and queueline as well as the entrance to this viewing platform.
From: https://twitter.com/TowersStreet/status/1637126318104903680
Not that it really needs pointing out as it was blatantly obvious anyway but that queue is clearly being readied for use as one of the speakers is facing into it (whilst one of them is facing out into FV).