I made this fractured ground simulation.
I want to export only last frame as an obj so I can import to Maya.
How can I do that? I'm really new of Houdini..and I can't find the way

Locate your DOPNet import geo node and dive inside. Drop down a Geometry ROP Output node and set the filename to .obj extension. You can typically render out the current frame or a series of geometry frames using this node.