Call Outlook procedure using VBScript

Tried & Tested!

Assuming that you have Outlook Application always running (according to comment below your question) you can do what you need in the following steps:

1. add a new task in Outlook, set subject to: "run macro YourMacroName" and set time (plus cycles) when your macro should start.

2. go to VBA Editor, open ThisOutlookSession module and add the following code inside (plus see the comments inside the code):

   Private Sub Application_Reminder(ByVal Item As Object)
   
   If TypeName(Item) = "TaskItem" Then
       Dim myItem As TaskItem
       Set myItem = Item
       If myItem.Subject = "run macro YourMacroName" Then
   
           Call YourMacroName    '...your macro name here
   
       End If
   End If
   End Sub
   

Where will I put the procedure in Outlook, Module or ThisOutlookSession?

Neither. Paste the below code in a Text File and save it as a .VBS file. Then call this VBS file from the Task Scheduler as shown HERE

Dim olApp, olNS, olFolder, olDraft, strfoldername, i

Set olApp = GetObject(, "Outlook.Application")
Set olNS = olApp.GetNamespace("MAPI")
Set olFolder = olNS.GetDefaultFolder(6)

strfoldername = olFolder.Parent

Set olDraft = olNS.Folders(strfoldername).Folders("Drafts")

If olDraft.Items.Count <> 0 Then
    For i = olDraft.Items.Count To 1 Step -1
        olDraft.Items.Item(i).Send
    Next
End If