Not all chicks hatch like little kick-boxers. If it didn't absorb all of the yolk sac, you'll see it hanging from the chick's vent or possible left inside the shell. If you've had other chicks hatch, you know that there is a little bit of umbilical that's still attached right when it comes out of the egg, but that separates shortly after hatch.
If there is any umbilical still attached, it should be almost fully collapsed and thin if all was absorbed correctly If it is thick and yellowy (like the yolk), then the chick may not have gotten full absorption, but a little leftover yolk that is NOT absorbed is not a cause for crisis, only when it doesn't get a most of the yolk sac.
With that said, I'd give the chick time to rest, checking on it every few hours and be sure that the temperature where it's been separated to is correct at 95 degrees - check that every hour if you can.
The chick MUST stay warm, but not too warm. Measure the temperature exactly where the chick is right now, not above it, beside it, or below it, but right were its back is located where it's lying down. Check the temperature regularly, and worry about feeding and watering tomorrow. Hopefully by then the chick will have gotten the needed rest and will be up and exploring. That may happen tonight too - each chick is slightly different, some more than others...
EDIT: try to resist the temptation to help a chick hatch. Some take a hour or less; others can take many hours, some even a day, though that's kinda pushing it. I'm glad to hear that it did some/most of the work on its own, but the rotation they do in the egg as part of the pip process helps them to start building muscle and coordination from the time they're ready to come out. The big push at the end to separate the egg halves is the next. Try to let them do that on their own. I know it's tempting to "help" them, but it's best to leave them alone