This is a modified version of RodgerWW's "About This Mac" workflow (shown on the Alfred Forums). However, I had a problem with the way it converted the Model Identifier into a nicely read string (It kept reporting my 2015-Macbook Retina as a mid-2011 Macbook).
This workflow contains a simple 1-line change to pull the nice identifier from Apple's website, via instructions found StackExchange.
Simply execute "about" to see the details of your mac.
Execute "xabout" to purge any locally cached detail, and regenerate the data (useful if you use multiple mac's).