Running an executable on multiple remote computers concurrently

I previously posted regarding a problem running an executable on a remote computer. That was resolved with th -Wait command.
So now I am having a different issue. the command runs one at a time on each server in the server.text file. The executable that I am running can take hours to complete so I want them to run concurrently on each server in the file. I have tried commands I have found to run parallel unsuccessfully. Any suggestions? This is my script that works well one at a time.

#Variables
$computername = Get-Content c:\shared\servers.txt
$sourcefile = “c:\shared\dummy.exe”
#This section will install the software
foreach ($computer in $computername)
{
$destinationFolder = “\$computer\C$\install”
#It will copy $sourcefile to the $destinationfolder. If the Folder does not exist it will create it.

if (!(Test-Path -path $destinationFolder))
{
New-Item $destinationFolder -Type Directory
}
Copy-Item -Path $sourcefile -Destination $destinationFolder

Invoke-Command -ComputerName $computer -ScriptBlock {
Start-Process ‘c:\install\dummy.exe’ -Wait
}

Use runspaces like with Invoke-parallel
https://gallery.technet.microsoft.com/scriptcenter/Run-Parallel-Parallel-377fd430

I have tried some of this, however, none of the examples are ever running an .exe on the list of systems. Most are just trying to return information regarding the system.

Use workflows, follow the link…

https://docs.microsoft.com/en-us/powershell/module/psworkflow/about/about_foreach-parallel?view=powershell-5.1

If you can make the exe available in all the machines , then below way will do the magic for you.

Invoke-Command -AsJob -ComputerName $ComputerName -ScriptBlock {
    Start-Process 'c:\install\dummy.exe' -Wait
}

Thank you, that was so simple and it is working. Folks having me try workflows and parallel commands weren’t working and were not as simple.