Hi Daphne,
Recently, we have released the OneDrive for Business Mac client to synchronize the OneDrive for Business library to the Mac PC.
Here is the related blog with the download link about the OneDrive for Business Mac:
Blog: blogs.office.com/.../onedrive-business-comes-mac-ios-devices
OneDrive for Business Mac: www.microsoft.com/.../details.aspx
Thanks,
Andy Sek