It's not clear what you're asking. Set the label text to something and then use boundingRect() to get the size of the label as displayed on the screen:
label = CreateObject("roSGNode", "Label")
label.text = "Some text"
w = label.BoundingRect().width
h = label.BoundingRect().height
If you've set the label's width and height to something then BoundingRect() will just return those values.
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