No I do not think so, to have the minimum of displacement, the line which joins the axis of the rocker arm and the axis of the roller must be perpendicular to the axis of the valve at mid-opening, so it is at this moment that the roller tip is furthest from the rocker arm axis, so it should not be in the center of the valve but a little beyond it.
So, if we look with the rocker arm to the left of the valve as in the picture, when the valve is closed the roller tip should be to the left of the center of the valve stem (0.4 mm for a total lift of 16 mm / 0.63 '') then it moves to the right, passes through the center and goes up to 0.4 mm to the right of the center at mid-opening, then it comes back to the left, passes again through the center and reaches its starting position when the valve is fully open. And he does the same movement again when the valve closes.
With this geometry the total displacement is only 0.8 mm; with a geometry where the roller passes through the center at mid-opening, the total displacement is much greater.
In my case, the roller is already well beyond the center to the right when the valve is closed, then it moves even further to the right to the edge of the valve stem at mid-open and returns to its starting position.