Stop running till the columns are deleted!

I have an excel spreadsheet with a lot of empty columns. I have a main macro that has some lines of codes, then calls a macro that deletes empty columns, then runs more macros. The problem is that the columns do not finish deleting before other macros begins to run. I have tried using Application.Wait, but that causes the columns to stop deleting. If I run the macros one by one, each one works perfectly. When I Call them in the main macro, bad things happen. Very bad. Here is the main macro.

Sub SG_RPAGSTDMMacro()

    Rows("1:1").Select
    Rows("1:55").Select
    Selection.Delete shift:=xlUp
    Cells.Select
    With Selection
        .VerticalAlignment = xlTop
        .Orientation = 0
        .AddIndent = False
        .ShrinkToFit = False
        .ReadingOrder = xlContext
        .MergeCells = False
    End With
    Range("A1").Select
    Cells.Find(What:="*** i", After:=ActiveCell, LookIn:=xlFormulas, LookAt _
        :=xlPart, SearchOrder:=xlByRows, SearchDirection:=xlNext, MatchCase:= _
        False, SearchFormat:=False).Activate
    Range(Selection, ActiveCell.SpecialCells(xlLastCell)).Select
    Selection.EntireRow.Delete
    Cells.Select
    Range("A1").Activate
    Selection.Sort Key1:=Range("B1"), Order1:=xlAscending, Header:=xlGuess, _
        OrderCustom:=1, MatchCase:=False, Orientation:=xlTopToBottom, _
        DataOption1:=xlSortNormal
    Range("B1").Select
    Cells.Replace What:=" ", Replacement:="", LookAt:=xlPart, SearchOrder:= _
        xlByRows, MatchCase:=False, SearchFormat:=False, ReplaceFormat:=False
    Cells.Select
    Call DelEmptyCols
    Call DoZ1CheckinX
    Call DeleteRowsifBelow0
    Call AutofitAll
End Sub

Here is the macro for DelEmptyCols

Sub DelEmptyCols()
' Deletes all empty columns on the active worksheet
Dim iCol As Integer
With ActiveSheet.UsedRange
For iCol = .Column + .Columns.Count - 1 To 1 Step -1
If IsEmpty(Cells(65536, iCol)) And IsEmpty(Cells(1, iCol)) Then
If Cells(65536, iCol).End(xlUp).Row = 1 Then Columns(iCol).Delete
End If
Next iCol
End With
End Sub