GNU/Linux Mint Installing MacBook Pro 15 2019 Wireless Driver Guide
Hi! The linked Tutorial shows you Step-by-Step How to Install MacBook Pro 15 2019 Wireless Wifi/Bluetooth Drivers in Mint GNU/Linux Desktops.
With Model Identifier: MacBookPro15,1/MacBookPro15,3 (To Check see: How to Identify your Mac)
First, the needed Broadcom Wireless Drivers are currently bundled in the New 6.2+ Kernels.
In any case this Guide include also detailed instructions about How to Install T2 Kernel on Mint.
But then what is easily missing is just the Non Redistributable Proprietary Firmware.
GNU/Linux Mint MacBook Pro 15 2019 Wi-fi/Bluetooth Driver Installation Guide
First, you may be interested in How to Upgrade Kernel Guide.
And then follow: How to Install Apple T2 Wireless Firware.
Last, in case of Issue you may see also: Linux T2 Kernel Installation Guide.