Generally, I can find MetCom on City Center, Mpls, Ramsey and Henn East, but City Center is the most reliable and i think it is its home talkgroup as that i what i would imagine the MW links between PSAPs are running on. Although the MetCom radio standard doesn't allow for mobile and portable users, i can verify that it does exist on a small select handful of Mobiles and portables, generally supervisors and some special task force users.
A little more about metcom... Traffic is generally very sparse as it is generally regarded as a talkgroup to be used only when there is a significant life or property threat and a phone call from Dispatch center to another Dispatch center would be detrimental. It also is used in similarily significant events, when a phone call would be practical, but multiple agencies, with unique dispatch centers all need to be notified simultaneously. Most often it is State Patrol notifying agencies or an event, Like if there was a Large car accident in Mounds View that MSP took the call for, they would need to notify Allina EMS, Ramsey Co Communications and Anoka Co Communications (Since SBM Fire is dispatched by Anoka Co). It also is useful for pursuits so that if a pursuit is intiated (for example) by MSP in Minnetonka, and they are moving EB on 394, St. Louis Park, Golden Valley (who will be dispatched by Edina as of 1 Jan), Hennepin County, Minneapolis and Ramsey counties cann all be made aware of the pursuit moving towards their jurisdiction...
It is a handy tool, but it isnt exceptionally busy...