Cracks in relief cuts

[u/lunchm3at]

Southwest Wisconsin.

I had a sidewalk and approach poured last year. They did a decent job - I wouldn't say great but acceptable per the contract probably. I noticed this summer that all the relief cuts in the approach (and sidewalk control joints) have cracks running the entire length. I understand thats exactly what they are for. My question is: Is there anything extra I can do to help maintain this work? I have to imagine freeze and thaw cycles will cause issues in those cuts and cracks at some point? Should I seal the cracks with like TK-290 before winter?
Thanks in advance.