I have a database with the following setup (2vCores and 500GB max size)

I want to increase the allocated max size from say 500GB to 600GB but, before performing that operation I would like to check if there is enough space for it.
I can get the existing maximum storage size (500GB) with the property "MaxSizeBytes" from the cmdlet Get-AzSqlDatabase.
Get-AzSqlDatabase -ServerName <server-name> -DatabaseName <database-name> -ResourceGroupName <resource-group-name>
how do I get the allowed maximum storage capacity using the PowerShell for the same 2vCores which is 1024GB? Is there any specific metric which from which I can get this information instead of from the portal?