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The short answer is no, the Mac Pro isn’t upgradeable to any if those technologies.
DDR5 RAM, is a low power, but double bandwidth compared to DDR4. Its a standard that hasn’t been released yet, and must be supported by the CPU. in order to support this, you would need to redesign the logic board to accept the new requirements and since it’s a non-...
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I am already on 10.14.6 so can't confirm this but have downloaded 10.14.6 Update (I didn't check the Combo Update) and looking the .pkg with Suspicious Package shows it includes Safari version 12 not version 13. Note it is 12.1.2 not 12.1.1 as you now have.
Mojave 10.14.6 Supplemental Update also contains Safari 12.1.2.
It isn't clear why you aren't ...
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Two sites that are very Mac friendly are the iFixit site and the OWC (Other World Computing) site. OWC sells SSDs and many other Mac upgrades. I suggest you search the site for what you are looking for.
An iFixit example guide how to install a second HDD/SSD (with links where to buy all required parts and tools):
Installing MacBook Pro 15" Unibody Late ...
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There are no drivers for NVidia 3rd party cards in Mojave.
Support ended at High Sierra.
MacVidCards - Which driver should I install for my new GPU? is pretty much the authority on this topic.
You can get to Mojave if you have a supported* ATI/AMD GPU with Metal capability, otherwise stay on High Sierra.
*Recommended GPU list, again from MacVidCards - I ...
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