Microsoft SQL Server equivalent to Oracle Enterprise Manger Top Activity Interface?
I think what you are looking for is Query Store, but this is available only for SQL Server 2016 or higher. 

For SQL Server 2014 or lower, you can set up an Extended Events (XEvents) session to capture the queries running longer than X amount of time. XEvents are really easy to use and quite intuitive, the only thing you should pay attention to is how much data you are capturing as it can have some impact on performance or fill up the disk quickly. The only draw back of XEvents is that it will not provide you with a chart.