MBP Mini-DisplayPort to USB-C Monitor
That cable won’t work.

First, the monitor doesn’t have a DisplayPort input nor does it have a USB upstream port.  It has a Thunderbolt 3 port that uses the USB Type C connector.  The USB-C down stream ports are supplied by the Thunderbolt connection. 

Secondly, even though TB is backward compatible, it’s one way.  So, a laptop with a TB 3 port can work with a TB 1 or 2 device, but a TB 3 device can’t work with a TB 1/2 laptop port.  The adapter can’t add capabilities to a machine that doesn’t already have.