I'd say you have 2 good eggs. One was probably a dud/unfertilized from the beginning.
Check the moisture, but I think you may be OK there. The eggs have gone this far and still look good. Sometimes eggs aren't completely pure white. I've had whole clutches that have looked all blotchy colored like yours and they did fine.
The dimpling is normal and the two good eggs will probably both do this.
I would check moisture, but otherwise not touch a thing.