Since my Mac Pro 2010 does not have a Metal capable graphics card Requirements. I am not able to upgrade to Mojave. Opted to install OpenCore which then allowed me to install Mojave. After upgrading to Mojave, I upgraded to Catalina.

Followed the guide over at the MacRumors Forum to install OpenCore on Legacy.

Already upgraded my bootrom to MP51.0089.B00 following another guide at the MacRumors Forum

Only had an issue losing Airport wifi after applying security updates for Mojave and Catalina. I basically needed to copy over the wifi drivers. Used the guide from Daniel Kozyatnikov to fix up wifi.