10:00 pm CT might be unsuitable for PST time zone
When planning a call between Central Time and Pacific Standard Time, you need to consider time difference between these time zones. CT is 3 hours ahead of PST.
It is 10:00 pm in CT. This does not fall within the span of usual working time between 9:00 am and 3:00 pm in PST, but it still might be suitable to arrange a meeting, since it would be 7:00 pm in PST, which is between 7:00 am and 11:00 pm PST time.