Well as I thought my old slow Ipad could not work with Lightroom mobile, so this week I just had to treat myself to the new ipad pro, and all works beautifully.
Using the connector, I imported 110 raw files to the ipad, each approximately 40MB in size.
I will keep all these as a back up, eventually exporting them to a portable hard drive from "photos" in my Mac.
I selected 20 photos and added them as favourites, then opened Lightroom mobile and made a collection from these favourites.
I worked on these images using Lightroom mobile and was surprised that I could use just about any feature, globally or selective, that is in lightroom desktop.
Later I went to my desktop and noted my images were all in a Lightroom collection there and what I really liked was that the original raw files had been synced from the ipad with the XMP adjustments to the folder structure that I normally import my files to i.e. capture date year/month/day.
It looks like I will not have to take my Macbook when I go away on holiday/shoots now as I should be able to organise and enhance my files from the ipad, with perhaps just a little finalising of the selected images.
The apple pencil pressure capabilities do not work with Lightroom yet, but this will be more useful with photoshop applications anyway and I look forward to trying this pencil out in the next few days.