PowerBI refresh data set sequentially

[Delphia]

Dear community,

I have a list of reports that use the same data source. 

They should be refreshed at night one after another. As the time needed to refresh report can vary, I don't want to use scheduled refresh.

There is a flow that was created for this purpose:

Nevertheless, it triggered report refresh at the same time and instantly send an email even if the report wasn't yet refreshed (or it's failed).

Is there any way to do the following:

1. Start Data Set refresh for Report 2 only when the first data set is refreshed.

2. Send an email notification when all reports are refreshed? 

Very appreciate your help!