As many anticipated, this afternoon Illinois Governor Pritzker issued a “shelter in place” order for the entire state of Illinois. In general terms, it means that people are expected to stay at home with limited exceptions for essential activities and essential business. The order takes effect at 5:00 pm on Saturday, March 21, 2020, and ends on April 7, 2020.
The order defines essential activities to allow residents to leave their homes to shop for groceries, go to the bank, laundromat, restaurant for take-out, or gas station, receive medical treatment, and care for the elderly or disabled. People can go outside to exercise. They can travel if it is to conduct essential business or activities. In all of these permissible interactions, however, social distancing precautions must be taken.
As a general rule, the order does not allow residents to go to work unless they work for essential businesses or operations. Examples of essential work include grocery store, hardware store, restaurant, and banking employees, essential infrastructure, health care, bankers, gas station employees, pharmacists, health care workers, critical trades (plumbers, electricians, etc), postal workers, delivery services, restaurants for consumption off-premises, transportation, professional services, daycare for essential workers, public works construction projects, and essential government operations, such as police, fire, and utilities, among others.  
You can read the Executive Order (Covid-19 EO No. 8) here
There are certain to be many questions about what type of work or activity is considered “essential” and exempt from the “stay at home” mandate. We also expect questions about enforcement which the order states will be done by state and local law enforcement officials. We plan to provide a more detailed summary of the EO and its provisions on Monday so stay tuned.