6:00 pm PST might be unsuitable for CT time zone
When planning a call between Pacific Standard Time and Central Time, you need to consider time difference between these time zones. PST is 3 hours behind of CT.
It is 6:00 pm in PST. This does not fall within the span of usual working time between 12:00 pm and 6:00 pm in CT, but it still might be suitable to arrange a meeting, since it would be 9:00 pm in CT, which is between 7:00 am and 11:00 pm CT time.