I won’t be able to access my mk3 for a few days. I have some funds in a multi-Sig with other brands, cold card being one. I should be good for now, right?
Multi Sig you should be good. Even if your mk3 is one of the signing devices so long as the others are not exposed to the same vulnerability as CC right now. I have an mk4 and took the precaution to move everything to MS too.
