Standalone, single screen, no internet

I would like to create a digital signage display that I would setup at my home location & then take the Pi to an unmanned office that does not have broadband. I understand that any assets would need to be saved locally but is there any reason why this won’t work?
I could feasibly go to the office at regular intervals & update the device by making my mobile a hotspot or even more easily taking the device home to update if this is required?

I know that I could just use PowerPoint on a pc but thought the Screenly package would give me better assets & an option to expand in the future.

I look forward to hearing your ideas, be kind though I am a newbie!

It’s possible, but not advised. You’d need to add extra hardware to the Pi (a Real Time Clock) for it to work properly without internet.