@Tykell30 These aren't dumb questions. If you buy a new Mac, as in, any model offered from Apple as new rather than refurbished, it will support Metal. The only ones that don't are older models, typically from 2011 or earlier; or ones running macOS Yosemite (10.10) or earlier.
Your games belong to your Origin account, not your computer. So you'll be able to login on your new Mac and download everything you own from your game library, including Discover University, which should run just fine. You can also transfer your existing saves from your old Mac to your new one, although it doesn't work the other way around: saves that have been played in the standard version of Sims 4 won't work in the Legacy Edition.
When you're shopping for your new computer, feel free to post in the Sims 4 Mac section asking for advice. Some Macs run the game better than others, so you might want to know what you'll be getting for your money before you make the purchase.
https://answers.ea.com/t5/Technical-Issues-Mac/bd-p/The-Sims-Mac