DAX GROUP BY values with filter and condition

Hi everyone!

Need help in Dax with this implementation:
What i have: 2 tables with "Date", "Time", "NPS" (scores), "Data source" tag (both table have same columns, diffirence in Data source tag)
What i need: grouping date/time/nps and if time in 1st source >= 2nd source i need with record key (combined text with Date/phone/time for filters later).

Having working M-code, but cant understand Dax variant...

 M-code:

let
Source = Table.Combine({IVR,SF}),
#"Grouped Rows" = Table.Group(Source,
{"fnPhone", "Date", "NPS"},
{
{"Count", each Table.RowCount(_), Int64.Type},
{"Condition", each Table.RowCount(Table.SelectRows(_, each [Data Source] = "IVR")) > 0 and Table.RowCount(Table.SelectRows(_, each [Data Source] = "SF")) > 0, type nullable number},
{"IVR", each Table.SelectRows(_, each [Data Source] = "IVR"), type table [Time=nullable time]},
{"SF", each Table.SelectRows(_, each [Data Source] = "SF"), type table [Time=nullable time]}
}),
#"Filtered Rows" = Table.SelectRows(#"Grouped Rows", each ([Condition] = true)),
#"Expanded IVR" = Table.ExpandTableColumn(#"Filtered Rows", "IVR", {"Time"}, {"IVR.Time"}),
#"Expanded SF" = Table.ExpandTableColumn(#"Expanded IVR", "SF", {"Time"}, {"SF.Time"}),
#"Added Custom" = Table.AddColumn(#"Expanded SF", "Custom",
each if [SF.Time] >= [IVR.Time]
then null
else Text.Combine({Text.From([Date], "ru-RU"), Text.From([fnPhone], "ru-RU"), Text.From([IVR.Time], "ru-RU")}, "|")),
#"Filtered Rows1" = Table.SelectRows(#"Added Custom", each [Custom] <> null and [Custom] <> "")
in
#"Filtered Rows1"

Data example:

Data SourcefnPhoneDateTimeNPS