Absolutely, but be careful about the corners you take when making a demo, or as someone else suggested, make it clear in the demo that something isn't done.
My first big assignment on my first job I presented a demo ~1mo into a 3 mo project. It didn't persist data, or work on more than one host, and it saved state to a json file on the one server I manually copied the executable to. Everyone is the demo doesn't see that, they see it working as expected. The first question I got was why can't we ship this today, it appears to work as expected?. PMs, SDMs, etc care a lot less about the "it takes a while to set up something that scales, and stores data in a safe encrypted database, etc" when they see something that works.
Now whenever I do a demo like that I append "DEMO DATA:" to any visible string, and ensure I demo at least one failed behavior, just to guarantee that no one thinks it can be shipped that day (if I know it can't).
It also depends a lot on the business context, whether you can trust leadership to respect technical debt or not.