Unfortunately they won't. These upgrades start well south of the end of the Southern Expressway.
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Threads relating to transport, water, etc. within the CBD and Metropolitan area.
Ideally within the next 10 years the expressway should be extended over MSR, the hill and the river to join Victor Harbor Road (probably around where Wheaton and Warners Roads are). This would be critical once the missing link at T2D eventually completes the North-South Corridor and should be built before T2D is finished, essentially extending the corridor to run from Nuriootpa and beyond to Willunga and beyond. All through traffic to/from VHR would then just drive straight through non-stop instead of snaking onto MSR to make the connection between the expressway and VHR.
The arrangement at the current southern terminus would likely remain largely unchanged whether this link gets built or not.