In my opinion not critical ASAP to replace the struts, if they are going out they may not dampen the springs as effectively, so you may notice a little more bouncy ride and you may be getting onto the bump stops more (if you even have any left at this point, they crumble away with age). However you should be OK, I did a lot of track driving on my shot struts starting at around 115,000 miles with only shreds of bump stops left and it was OK. I could sure tell a difference once I got it all replaced though
I did all the work myself so it was only parts cost, for me it was around $1000'ish for 4 new Koni FSD dampers, new bump stops, and new strut top mounts in the front. I kept my backs as they looked very good with no cracking and so forth that I could easily see in the fronts.
In my opinion at $3400 to replace the struts, the price is wrong. Even refreshing all the rubber bits (bump stop around $10 each and front strut top mount, around $35 each, backs were more) and the strut itself ($250'ish for Bilsteins although there now appear to be some budget replacements), $3,400 is way too much in my opinion.
Brakes at $1,000 is way too much too, you can get 4 OEM style Meyle rotors for an S model for around $200'ish, OEM style brake pads for <$100, and replacing it all is only 1-2 hours for all 4 corners. Base rotors may be even less.
Struts is a tough job for a first time DIY, but brakes is an ideal first time DIY project.
Are these full dealer prices at a Porsche dealership? Maybe you could find a trusted indy shop that does Porsche, should come to much less than the prices you are quoted above.