Can I update older Mac Pro mid 2012 to 10.15?

if that is a MacBook Pro, you can run 10.15 Catalina if you want to.

How to get old versions of macOS - Apple Support

BACK UP your Mac before you begin -- there is no UNDO.

If that is a silver tower Mac Pro from 2012, Niel is correct: 10.14 Mojave is the last Apple-supported version of MacOS, and Mojave can only be installed with a metal-capable graphics card added.

A 2012 desktop Mac Pro can't be upgraded past Mojave.

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what model-year is that again?

any MacBook Pro early 2015 or later is eligible to run Monterey, if it meets all the other conditions as well (like memory size, storage available).