It depends on the programs themselves. CERB, for example, ran at about—if I'm not mistaken—$6 billion to $8 billion per month. The wage subsidy is probably running at close to a few billion dollars a month, so it depends on which programs you're talking about and on exactly when you're thinking about extending them. Extending a program when the economy is in a recovery phase is much less expensive than extending it, for example, right now when lockdowns are still in place in many areas of the country.
So, it depends on when these would get extended, but you're talking about easily $10 billion a month if you were to extend all of these programs beyond their scheduled expiry dates. Again, that's with huge caveats.