I was also thinking of giving them more time to hatch or until they perish inside their eggs. I wouldn't have a clue when or how to safely cut them open without harming them anyway.
Your advices proved very helpul and reassuring. Once again thanks Nick, Tom and John!
Now I have a surprise for y'all... Yes, you guessed it.
They're finally hatched today!!! I'll have some pictures and post them as soon as I get back home shortly.