I noticed a crack in the strut mount rubber of my 1999 Volvo v40. The suspension often creaks when going over speed bumps (and sometimes it doesn't) though I'm not sure it's the fault of this mount. Everything else looks good.
I realize that a completely broken mount could cause the strut to come out of it's place and cause bigger issues, though how much of a problem is this on a scale of "fix it ASAP and don't drive until you do or you'll die tomorrow" to "you're good for another year, keep driving and occasionally take a look if it's getting any worse when you're super bored". As I understand this is going to be a tiresome job, so I would prefer to avoid it for as long as I can, there are other problems to address.
Here's how my mount looks like:
Here's how a new mount looks like: