Can you show and work with two notes at one time on iPad Pro?

Yes. You can use Split View to have 2 notes open at the same time.

See here: link-> Use multitasking on your iPad - Apple Support

Yes. Use multitasking.

Information about using multi-tasking can be found in this support page:

Use multitasking on your iPad - Apple Support

The iPad User Guide is also a rich source of information about using iPad and its many features. The Guide is available both online using a web browser (such as Safari), or as an Apple Books download:

iPad User Guide - Apple Support

https://books.apple.com/book/id1567104892