Until the first Interval has been collected, PMIM has nothing to report on.
Example: #PMOPT specifies INTVSIZ=10
Interval is 10 minutes.
The interval is based on 10 minute increments of the Time of Day. It is not based on the time the CV was started.
So if CV comes up at 08:11:36, PMIM will show that "No Intervals Have Been Collected Yet " until 08:20:00. At 08:20:00 PMIM will show "Interval Monitor is Online and Collecting Data " and you will have the first interval's stats.
If CV had started at 08:18:12 the delay would be less. The first interval will also be available at 08:20:00.