Greetings, Clair!
I think it depends who you are telling. I see nothing wrong with telling “people” in general that you are Catholic. However, if the bishop of your diocese came along, you should probably give him the long explanation of your status.

I would put it on a hospital form, for example, since I would want a Catholic priest called in certain situations.
Catechumens are allowed a Catholic funeral and a Catholic wedding so in a broad sense the intention of your heart makes you Catholic already. (See here:
standrewbc.org/rcia_new07.html).
Also, this pertains to your situation:
Read more
HERE
I know it can seem hard to wait, but remember that you can make a spiritual communion during Communion.