Powershell - Pulling a single users info from a .csv

I am creating some AD and MSOL users from a CSV using powershell. The users get created fine using ‘import’ and then ‘for each’ commands.

----------------------------------------------------

$UserCSV = Import-Csv -Path "C:\Path.csv"
       
    foreach ($User in $UserCSV)            
    {            
        $FirstName = $User.Firstname        
        $LastName = $User.Lastname
        $UserName = $User.Username.ToUpper()
        $Password = $User.Password
               
    # Create User Commands          
    New-ADUser -Name $UserName etc etc
    }

--------------------------------------

But then once the users are created I want to sync them to MSOL, and as this tends to take a while check one of the users exists before moving on to the next lot of commands.

How can I pull just one of the users details from the .csv and set variables based on that single users info?
ie:
$Username = ‘The last user in the .csv username’
$emailaddress = ‘The last user in the .csv email address’