public boolean hasOldestEstimatedArrivalTime() {
      return ((bitField0_ & 0x00000002) != 0);
    }
<pre>
Output only. An estimation of the nearest time in the future where a task
in the queue is scheduled to be executed.
</pre>

<code>
.google.protobuf.Timestamp oldest_estimated_arrival_time = 2 [(.google.api.field_behavior) = OUTPUT_ONLY];
</code>

@return Whether the oldestEstimatedArrivalTime field is set.
java-tasks/proto-google-cloud-tasks-v2beta3/src/main/java/com/google/cloud/tasks/v2beta3/QueueStats.java