Is 89% saturation acceptable?

In this video, I answer a question from a viewer, who says that her father was discharged from the hospital due to pneumonia and pleural effusion. She also says that he will be taking antibiotics for a week, but his oxygen saturation is between 89 and 90%, and when he exerts himself or at rest, it is between 93 and 94%. I would like to know if this value is acceptable. In the video, I explain that yes, it is somewhat acceptable and within the perspective; I explain the reason for all these symptoms and advise that respiratory physiotherapy intervention could be interesting in this case.

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