All the edit information stays under the catalog.
You just need to copy the Lightroom 6 catalog from your windows machine to mac.
Also when you will open the catalog you might need to update the location of your folders.
Hi Jitendra, thx for your reply.
When I select the LR 6 catalogue it won't open. Message says too new. So I was forced to open my old LR 5 catalogue. The issue is I need LR version 6 to open the recent catalogue and I cannot find LR 6 download for Imac.
this is the solution. LR6 is updated and all my work between LR5 and is LR6 YTD retrieved. Thanks
That is really good to hear