If you wish to display the ETA Time in the Driver App, you may do so by performing the following steps:
Navigate to Settings > Job > Fields.
Check the box under the Driver App column corresponding to the ETA Time field.
Scroll down to the bottom of the screen > Save.
Thereafter, whenever an ETA Time is being entered into your job under Jobs > Deliveries / Collection > Add Delivery, it will be displayed on the Driver App.
Screenshot from Driver App with the ETA Time being displayed.