Get-ADUser(s)

Ive got a simple PowerShell script, which checks an account for when the password was last set:-

Get-ADUser -identity tony.cross -properties passwordlastset | sort name | ft Name, passwordlastset

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But I want to check several users. Short of putting them into an array and checking each one at a time, is there a way I can put them in an array and check them all, eg:-

$arr = ['tony.cross', 'user4', 'user3']
Get-ADUser -identity $arr -properties passwordlastset | sort name | ft Name, passwordlastset

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Any ideas?