Fans will be able to pay respects from 8:00 a.m. until 12:45 p.m. Then, fans will be directed to seats for an on-field tribute that will begin at 1:00 p.m.
The Phillies say additional information will be made public as details are finalized.
Funeral services and burial will be private and held early next week.
Also, the Phillies announced, players will wear HK uniform patches for the rest of the season.
The black circular HK patch will be located on the front of the jersey in the area of the heart.
The Phillies return home on Friday night to play San Diego at 7:05. The Phillies will also pay tribute to Harry prior to the game.
Fans are urged to arrive early.
Meanwhile, an autopsy performed Tuesday showed that Kalas died of cardiovascular disease.
A spokeswoman at the Washington D.C. chief medical examiner's office said Harry Kalas, who died Monday, had high blood pressure and suffered from atherosclerotic cardiovascular disease. The disease, in which plaque buildup restricts blood flow in arteries, is a major cause of heart attacks and strokes.
Known for his signature "Outta here!" home run calls, Kalas died after collapsing in the broadcast booth before the Phillies' 9-8 victory over the Washington Nationals. He was 73.
Kalas is survived by his wife and three sons, including one - Todd - who is a broadcaster for the Tampa Bay Rays. Funeral arrangements are pending.
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