It seemed unrealistic for baseball to resume on April 9. With spring training canceled and the first two weeks at least postponed, that was the targeted date for the San Diego Padres to open their season. However, the Centers for Disease Control and Prevention (CDC) recently recommended that events with 50 or more people be postponed or canceled for the next eight weeks.
Last time I checked, Petco Park holds more than 50 people, so that would likely resume baseball activities around mid-May. Players would need a couple of weeks to ramp up their activities, which then puts a start date near June 1.