The government credits are now being applied to accounts.
It would appear to have been credited already by most of the providers. They do mention up to 31st December in that article.
I know El Irl applied ours before we moved to Bord Gais recently. I think I read somewhere that Bord Gais hoped to have applied them by mid-December.
A friend told me that Energia had applied theirs.
ESB Networks make the payments to the companies so if you do run into problems you could check it out with either the providers, ESB Networks or the Regulator.