When people get sick with a respiratory virus, the updated guidance recommends that they stay home and away from others. For people with COVID-19 and influenza, treatment is available and can lessen symptoms and lower the risk of severe illness. The recommendations suggest returning to normal activities when, for at least 24 hours, symptoms are improving overall, and if a fever was present, it has been gone without use of a fever-reducing medication.
So yes, the guidance is that you isolate until you are fever free and other symptoms are at least improving. The major change is that they don’t recommend a fixed length of isolation anymore.