(Using Blender 3.6.8)
First attempt
Assuming that the flat model should roll like a film, the first parameter to change is the curve Tilt, to set to 90°. Furthermore as the underlying Plane object is remaining flat, it is disconnected in the Geometry Nodes graph, to keep only the box instances and to produce the following result:
Resources:
Second attempt
Assuming that the flat model should remain flat and coplanar to the spiral, and that it should not be stretched radially, but only bended in the (X,Z) plane, the parameter to change is the Curve Deform/Radius parameter to uncheck in the curve Object Data Properties panel. Otherwise, the scale perpendicular to the curve tangent is modified. Furthermore, the flat model is scaled down to remove overlaps and to produce the following result:
Resources: