Previously, the only way to see a company's Google Posts, all of them, was to try to access them on mobile. Ben Fisher posted on Twitter that the option to view all Google Posts are now available on desktop as well.
I tested it for my company and it indeed works both on mobile and desktop.
Here is the desktop local knowledge card for my business, with the Google Posts showing a "view all" button:
It looks similar to the mobile version:
When you click on view all from desktop, it shows a hover overlay of all the Google Posts and you can scroll through all of them. Here is my first Google Post for my business:
The mobile version experience takes you into the Google Posts view, without a hover over interface:
I enjoy Google posts, in fact, it is part of my blogging social sharing routine. When I post a blog post at my company blog, I share it on Twitter, Facebook, LinkedIn, Google+ and yes, Google Posts.
Forum discussion at Twitter.