I would do it now so you're done and don't have to open it up later and risk shrink-wrapping any of them.
I would think you'd hear a peep, but they don't always.
That's amazing if it's going to hatch 5-6 days early. Like @TwoCrows said your temps are within range, but if it mostly ran on the high end of 100.5 for 15 days, that's 1 degree over the preferred setting of 99.5. I could see eggs maybe hatching a day or two early in that case, but 5-6 days...