From ICTS – doesn’t actually say how long before everything is finished:

The installation of individual print drivers onto UCPrint1 was completed successfully last night. This morning we received feedback from those priority queues updated first that confirmed our solution was successful. Each print queue is now in the process of being manually updated, with 75 of 384 queues having been successfully updated already so far. Approximately a third of the 384 queues are in an inactive state and may not require updating.

Please continue to contact the ICT Service Desk if you are aware of urgent printing issues, as these queues can be prioritised to be manually updated.