Yes, they will flower because the flower is already in the bulb, but could be a bit later than spring. Get them in the ground ASAP

if you have firm daff bulbs then yes get them in. they will flower this year but they may not next year but they will the following one.

I would certainly have a go and plant them now.....as long as the ground is not frosted. Plant them a little deeper - say 3 times the depth of the bulb. You have nothing to loose. It will be interesting to hear if they have flowered and when. Good luck.