Users that turn-on and go through set-up on their 2018 iPad Pro prior to activating either by calling Care, through a Retail location, or via Web, will need to perform a power cycle and access the Cellular Data menu to trigger the eSIM download. This will allow the device to fully provision.
Note: Users that activate via on-device flow will not need to do this as the download of the eSIM will occur automatically.
The 2018 11-inch iPad Pro and 12.9-inch iPad Pro (3 rd Gen) are LTE only devices (no 3G/2G). When activated with cellular data plans, these devices will only work over cellular in markets/locations with LTE coverage.