Follow up to this thread

I used the following Macro to combine data from 3 files (Files 1, 2 and 3) into one Master file. Files 1, 2 and 3 will be files that are generated daily so I want to be able to update just the master file every day:

Sub filesToMain()

    Dim fso, oFolder, oFile
    Dim myWB As Workbook, oWB As Workbook

    Set myWB = ThisWorkbook
    Set fso = CreateObject("Scripting.FileSystemObject")
    Set oFolder = fso.GetFolder("C:\Users\filepath")

    For Each oFile In oFolder.Files

        oRow = myWB.Sheets(1).UsedRange.Rows.Count   1

        Set oWB = Workbooks.Open(oFile)

        oWB.Sheets(1).Rows(1).Delete
        oWB.Sheets(1).UsedRange.Copy myWB.Sheets(1).Cells(oRow, 1)

        oWB.Close False

    Next oFile

End Sub

Now, once this data has been appended to the master file, I want to automatically delete the data that is in files 1, 2 and 3, or actually delete the files themselves so that I do not accidentally duplicate the data.

Additionally, once the data has been copied from the master file, I want to automatically sort the rows in the master file chronologically. Column 1 will be date and multiple rows can have the same date.