which processor do I have

In addition to what BobTheFisherman has provided you, you can also get more details on which processor your Mac has by doing the following:

1. Hold down the option key, and then, select the Apple logo in the upper left-hand side of the macOS menu bar.
2. Select "System Information."
3. When the System Information pop-up window appears, select "Hardware" and you should be greeted with a Hardware Overview that includes detailed information about your Mac's CPU.

If you also want info about your Mac's graphics processing, just select the "Graphics/Displays" option under the Hardware category.

Click on the Apple menu > About This Mac located in the top menu left side.