You have to filter order by status in Order Page ? Order Statistic will do it and show on dashboard.
Order Statistic

+ Order Statistic will show number of order, total order by order status on dashboard.
+ You can filter by day , last moth or this month.
+ You can set order status set icon, icon color, background color in setting.

To use Order Statistic:

1. Dowload and import extension to Opencart.
2. Go to extension -> dashboard -> Order statistic to edit extension.