Please note, Newly registered .gr domains will remain in status "processing" until the domains are fully registered after 4-8 weeks. The official registry (EETT) examines the application within a period of 4 - 8 weeks from its submission by the registrar to the Registry.
Please check the below URL for more information on this
https://grweb.ics.forth.gr/public/domains/registration?lang=en