photos from MacBook Pro

You are correct. The Photos app on iPhone and iPad does not support display or maintenance of keywords or descriptions. It does display dates in some contexts, but not allow them to be manipulated.

There are some third-party utilities that can access the Photos library on iOS/iPadOS to display and even update many characteristics of photos, including those you mention. None is a complete replacement for the capabilities of the Photos application for macOS.

Oddly, iOS/iPadOS Photos does support limited searching for both keywords and descriptions that were added by macOS Photos. (See example search below.) It also allows some limited searching for dates.

When we upgraded our computer they assured me the photo transfer would preserve all my dates etc and it literally was just a dump of photos so I had to redo everything and now this.

What did you upgrade from and to? Who are "they" and what exactly did they assure.

The upgrade from iPhoto to Photos kept keywords, titles, descriptions and dates intact as well as Events which became albums. The only disconnect in the migration was projects.

What software are you using for organization? If you are using Photos, just copy the Photos Library over.