Upon Major League Baseball initially delaying the start of the 2020 season for two weeks because of the coronavirus (COVID-19) pandemic, the hope remained to play 162 games. That still held true when MLB delayed Opening Day a second time.
The latest case was in relation to the Centers for Disease Control and Prevention suggesting all gatherings of at least 50 people be cancelled through May 10. Assuming it holds true for the next several weeks, MLB would not be able to begin a second Spring Training until the middle of May.
Thus, that rough timeline points to the 2020 MLB season likely not beginning until June.