Nice rifle!
You might also consider:
1. Shooting mat
2. Spotting scope
3. Bore guide
3. Bipod (maybe)
The shooting mat is good if you're planning to do a lot of work from prone -- laying on concrete or gravel at a rifle range isn't that much fun after a while. Doubly so if you're slung up tight.
You can use a hikers sleeping mat, but in my experience those tend to roll up and be awkward when using with a rifle. Something like this is pretty cheap but still gets the job done: https://www.midwayusa.com/product/1019881885
The spotting scope is useful when you are zeroing the gun -- you can set it up on a tripod right next to you and check out how you're grouping. Plenty on Amazon for around $100.00, should be good out to 100 yards or so. Obviously with optics, the sky's really the limit.
Bore guide is something I think is very important, it keeps the cleaning rod centered and helps protects the bore from scratches when you are cleaning the rifle. Something like this:
https://www.brownells.com/gun-cleani...prod25927.aspx
The bipod I'll call as a "maybe" -- you can probably use a ruck or some sandbags as a rest for the rifle when you are zeroing it/learning to shoot. The bipod is useful though when you are cleaning the rifle or installing the scope and want a way to keep it upright, or to put it down while in the field without getting the rifle too dirty. Harris makes a nice one from what I've seen, though, it is extra weight which you might not want.
Hope your scope mounting is going well!