Cage First Guinea Pig Set-up Any Advice before their arrival

Looks good to me. The only thing I'd suggest changing is that water bowl (if that's what the white thing is). They get really yucky really quickly, and water bottles are a much cleaner way to give them water.

I would suggest getting a second hay rack and water bottle. That way, they can both eat/drink at the same time and if one hay rack runs out, or a water bottle gets clogged, there's a back up.

It looks pretty good.
Something to add would be a pellet dish that cannot be tipped over, if you haven’t already got one. Also, another option for the kitchen bedding could be disposable paper bedding (it’s really hard to get hay off fleece bedding). One more thing to do would be to check whether the fleece ‘wicks’, if you haven’t already by seeing whether any water dripped onto the fleece sinks straight through to the u-haul underneath.

Piggly, that's what that red thing is. It's a dual purpose hay rack/food dish.
However, on the subject of that particular dish... I didn't like it at all. I had one just like it and the only thing that managed to happen was that they got hay all over their food and I wasn't sure if they were eating properly. It seemed a good idea when I picked it up, but it just doesn't function the way you'd expect. Not to mention that I had this suspicion i wasn't very easy for the mto get the hay out of over the dish anyway.
That's my two cents.
Also, @bpatters that is a water bottle, and a second one is lying near the cage. I clicked on the picture to get a better look.