Recommended mileage for shock replacement time 2018

[NGN]

I own a 2018 crew cab 4x4 1500 Silverado with 49,000 miles.
In all my previous owned trucks I would replace all shocks at 50,000 miles, it was relatively cheap and easy to do myself, worth the comfort and piece of mind which I believe help keep my front end parts lasting the high miles I got along with the tires. Well now that this truck has struts up front it will now be a bit more to replace due to needing and alignment along with the new fully packaged sturts which is my understanding. I got one quote for $ 650.00 to do all four corners, a bit of a shell shock for me. I think I'll take on the replacement myself but have no way of doing the alignment which is about $140.00,,, BOOM!!!
So my question is what miles do you all out there think is a time to replace. As I mention I like the comfort and piece of mind but man how the prices changed.
I don't beat my truck, well,,,besides driving on Jersey roads lol.
Thanks for any thoughts
NGN
Nick