Your suspicions are correct - that's a baby roo.
If you plan on moving the chicks into the new coop in a few days, they're more than ready. To prepare them and acclimatize them to cooler temps, you need to turn off their heat lamp now. Both day and night. They don't need it.
If today is sunny and calm, take them outside for a romp for a couple hours. Hopefully you have the run set up. They can watch you work on their coop.
Thanks for the info, my chicks arrive next week. A newbie at this as the last time I had chicks was 30+ years ago.
Tomorrow increase the time you let them play outdoors, each day increasing the time until you make the big move. They should be fine with no heat in the coop.
For other newbies reading this thread, you are weaning your chicks off heat practically as soon as you get them. You begin with the lowest temperature under the heat source you can get away with, from 80F-95F, according to what makes the chicks comfortable. No. There is no law that demands you start your chicks at 95! Then at the end of the first week you're reducing it, and reducing it further each week until you get to 70F.
The rest of the brooder should be much cooler so the chicks have space to shed excess heat. By age three weeks, according to the ambient temp, they probably won't need heat any longer during the day if it's around 70. By age four to five weeks, they should be completely weaned off heat.