iPadOS 12.3 (build 16F5129d) is an official Apple over-the-air update for the iPad Pro 3 (11-inch, Cellular, 1TB Model), released on 2019-04-08T17:04:40Z. The update package is 387.09 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9203ea86a1fb07a37e3fcd94f8cb36a62f3ac919.zip.