[Bob Fares]

Add this expression to the anchor point to center the anchor point to the middle:

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l= sourceRectAtTime().left;

t= sourceRectAtTime().top;

h= sourceRectAtTime().height;

w= sourceRectAtTime().width;

[l+w/2,t+h/2]

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to center the text in the middle of the comp, add this expression to the position of the same text:
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cw = thisComp.width /2;

ch = thisComp.height /2;

[cw,ch]

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