You can 'candle' the eggs at a couple of stages through the incubation process to see if they are all good. Wouldn't do it now though with only a couple of days to go as (hopefully) the egg would look like a solid mass of all chick.
I'm also hanging out to see how they went
You probably already know this but anyway...
To candle eggs... a desk lamp or small lamp, or a torch will do.
Get a cardboard box big enough to go over the lamp or torch, cut a hole about the size of a 20c piece in it. Small enough so the eggs can't slip through.
Sit box over the light (in a darkish room, and warm, so they do not get a shock of temp change) and put the eggs one at a time over the light.
after about day 7 - 10 they really start to show - dark spot in centre with veins all about.
Look for any that show no signs of developing at all ie are clear right through. Check again at 14 days.
That way you can throw them out (before they explode) if they are no good...
Make sure its nice and humid to make it easier for the chicks to get out. You've probably already got a small dish of water in there with them... extra important as they are about to hatch.
Once the chicks hatch be very very careful with temperature changes etc, don't keep opening the incubator. Leave them in there for at least 24 hours after hatching.
If a chick has cracked the shell but after half a day is not coming out, but is still chirping, you can help it out. Sometimes they get stuck to the shell, esp if humidity was too low.
We used to use tweezers to gently pick off bits of shell, the top bit where the air bubble used to be will come away easily.