Dual Monitor Setup

Apple only produces an adapter when they have something special to add.

In the case of many adapters for third-party displays, appropriate adapters have been left for aftermarket developers to make and sell.

Your ThunderBolt-capable ports use a USB-C connector, that can be customized for MANY different purposes, such as a Displayport adapter/cable like this one:

Monoprice USB Type-C to DisplayPort 3.1 Cable - 5Gbps, Active, 4K@60Hz, Black, 6ft -- Product # 24444 - $13.34   

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Adapters for the Thunderbolt 3 or USB-C port on your Mac - Apple Support

- "Learn about the adapters and cables that you can use to connect an external display or projector to your Mac."

About the Apple USB-C Digital AV Multiport Adapter - Apple Support

Connect a display to your Mac - Apple Support

Identify your MacBook Pro model - https://support.apple.com/HT201300 - Then click on the technical specifications link for the MBP you have.