will high sierra work for a MacBook pro mid2012

Sure, it will work.

Upgrade to macOS High Sierra - Official Apple Support

Especially if you're making a large jump in operating system versions (not recommended as a standard practice), check your application compatibility here:

https://roaringapps.com/apps

system specs other than it has 16GB RAM and 2 SSDs nor the third party apps installed

No problems on 2012. macOS High Sierra - Technical Specifications

Always advised to have a current backup plan. How to create a boot clone

(You can google more: "3-2-1- Backup Strategy")

MacBook Pro (15-inch Mid 2012), macOS (10.13.3), i7 480GB SSD 16GB RAM iPhoneSE iOS11.2.5 Parallels13.0.1, HP OfficeJet Pro 8620

chrispy87 wrote:

It will work but expect a significant shift in the speed of the lap

Do you mean it will run faster or slower and what do you base that on considering you know nothing about the system specs other than it has 16GB RAM and 2 SSDs nor the third party apps installed?

I think it will run High Sierra just fine given what we know.

Read Upgrading macOS without fear. It is intended to address the concerns you express.

It will work but expect a significant shift in the speed of the lap