no need to worry abouc
you can update the ONIP , which is just formality , there 2 solutions here,
since you already informed ONIP,
go to you cic login, update the forms where you declared you are single,
so when you get invited, your wife will also be included in the process,
keep a valid marriage certificate, that's all you need to do,
ONIP will not do anything as the nomination is based on the condition at the time of applying to PNP expect any criminal activity at the later stage which is not the case.
nothing will impact , you just need to give change in family status in CIC EE profile and do it ASAP, their won't be any impact in ONIP,
but you need to declare your wife name and her details in EE profile, do it as soon as possible before you get ITA invite.