It is very likely to make them late! That late in development, I don't think you should worry about deformities. Hopefully everyone is still looking good come lockdown candle, they werent too far off so fingers crossed they were resistant and well along enough to just take some extra time to do the job instead of quitting. I hope they pull through!
Sorry you lost power! We were somehow spared from the wind yesterday, which was nice since we were without power for three days straight in November. Your eggs still have hope. Lots of people have hatched eggs that got cold or after a long power outage. I had an egg that got kicked out of the nest one night. It was completely cold when I found it in the morning. I stuck it back under the broody and it hatched just fine in day 21. Best of luck to you!
Thanks for the reassurances.