Write-Progress in PowerShell script for installing Missing Updates

Question

Hi, I had a previous question here
https://social.technet.microsoft.com/Forums/windowsserver/en-US/88931488-3b2c-4c08-9ad3-6651ba9bbcef/action?threadDisplayName=progress-indicator-for-installing-missing-sccm-2012-r2-updates
But that method is not working as expected.  The progress bar displays then continues to increment past 100 throwing an error each time.
I'm thinking I could use a foreach loop for the missing updates but I'm just lost when it comes to Powershell syntax.
For example:
# Get the number of missing updates
[System.Management.ManagementObject[]] $CMMissingUpdates = @(GWMI -ComputerName $server -query "SELECT * FROM CCM_SoftwareUpdate WHERE ComplianceState = '0'" -namespace "ROOT\ccm\ClientSDK") #End Get update count.
$result.UpdateCountBefore = "The number of missing updates is $($CMMissingUpdates.count)"
#Install missing updates.
#Begin example code, not tested.
Foreach ($update in $CMMissingUpdates)
$i++
If ($CMMissingUpdates.count) {
$CMInstallMissingUpdates = (GWMI -ComputerName $server -Namespace "root\ccm\clientsdk" -Class "CCM_SoftwareUpdatesManager" -List).InstallUpdates($CMMissingUpdates)
Do {
Start-Sleep -Seconds 15
[array]$CMInstallPendingUpdates = @(GWMI -ComputerName $server -query "SELECT * FROM CCM_SoftwareUpdate WHERE EvaluationState = 6 or EvaluationState = 7" -namespace "ROOT\ccm\ClientSDK")
#end my example code.
#The code below is working to install updates but Write-Progress isn't.
If ($CMMissingUpdates.count) {
#$result.UpdateCountBefore = "The number of missing updates is $($CMMissingUpdates.count)"
$CMInstallMissingUpdates = (GWMI -ComputerName $server -Namespace "root\ccm\clientsdk" -Class "CCM_SoftwareUpdatesManager" -List).InstallUpdates($CMMissingUpdates)
#Set the missing updates to variable for progress indicator.
$updates = $CMMissingUpdates.Count
$Increment = 100 / $updates
$Percent = 0
Do {
Start-Sleep -Seconds 15
[array]$CMInstallPendingUpdates = @(GWMI -ComputerName $server -query "SELECT * FROM CCM_SoftwareUpdate WHERE EvaluationState = 6 or EvaluationState = 7" -namespace "ROOT\ccm\ClientSDK")
#Not 100% sure $result.UpdateCountBefore is needed below.
$result.UpdateCountBefore = "The number of pending updates for installation is: $($CMInstallPendingUpdates.count)"
Write-Progress -Activity "Updates are installing..." -PercentComplete $Percent -Status "Working..."
$Percent = $Percent + $Increment
} While (($CMInstallPendingUpdates.count -ne 0) -and ((New-TimeSpan -Start $StartTime -End $(Get-Date)) -lt "00:45:00"))
Write-Progress -Activity "Updates Installed" -Status "Done" -Completed
} ELSE {
$result.UpdateCountAfter = "There are no missing updates."}
$result

Answer 1

The increment should be 100  / (max number of items)
That will not exceed 100 through (max number of items ) iterations in a loop
Mathematically that can be written as 
100 / (Max Number of items) * (max number of items ) iterations in a loop
= 100 * ( (Max Number of Item) / (Number Iterations in a loop) )
= 100 * 1 = 100
The (max number of items) and (Number of Iterations in a loop ) need to be based on the same number.
In the script, it is not based on the same number.
The maximum number of items is $CMMissingUpdates.Count
The number of iterations in the loop  is based on the condition 
($CMInstallPendingUpdates.count -ne 0)
Which causes the iterations of the loop to exceed $CMMissingUpdates.Count
Assuming the $CMInstallPendingUpdates.count is going down (is decremented) through the loop, then
$Increment = 100 /
$CMInstallPendingUpdates.count