If you have tested positive for COVID-19 or if you have been exposed to COVID-19 and then develop symptoms, you should stay home. The previous recommendation to stay home for 5 days has been replaced with a recommendation to stay home until 24 hours have passed since you had a fever (without taking fever-reducing medication) AND your symptoms are improving.
The best way to protect yourself and others from respiratory illness is to stay up to date with your COVID, flu, and RSV vaccines if you are eligible.