They look great. Make sure temps don't go over 91 at any point, as that can damage the embryos. Keep them above 86 at all times, too. The fluctuation range you describe won't do any harm.
If an egg dies, it will dent, then discolor and turn slimy on the outside, and firm on the inside. Your eggs are nice, plump and white--they are alive.
When they get close to hatching, don't panic--often (though not always), they will dent like crazy, sometimes a couple weeks in advance, and then start to sweat just before they hatch. The last few days before hatching, the embryo grows like crazy, and you can actually feel the snake inside the egg just before it pips.
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