You can use the prstat command described in the prstat(1M) man page to monitor CPU usage by active projects.
You can use the extended accounting data for tasks to obtain per-project statistics on the amount of CPU resources that are consumed over longer periods. See Chapter 4, Extended Accounting (Overview) for more information.
To monitor the CPU usage of projects that run on the system, use the prstat command with the -J option.
% prstat -J