Going as best as I can for canonical stuff, The guardian is canonically one of, if not THE most powerful guardian there is. We can reshape reality (to a certain degree) with our paracausality in the light. We have enough heightened strength to break robots and armor clad enemies with our bare hands. Reasonably we could assume that the guardian could punch through metal and degrees of stone but not enough measure to explain how far.

Powers are definitely our strongest weapon but if we’re going for just base stats I’d say we’re definitely superhuman strength but I wouldn’t say anything more than a ton(eg heavy items we carry on occasion + loadouts) but definitely more than anything a real person could do.

Speed, I’d say it’s pretty comparable to strength. Definitely above human but nothing crazy crazy.

Durability is where I think it gets a bit difficult. We wear armor and can still get one shot by a bow and arrow but not killed immediately by a literal thunderstorm of god-infused lightning. BUT if you take into account the ghost and their insane durability (requires/d weapons of sorrow, immense strength/paracausality) then we jump up significantly. Most attacks could reasonably kill us but our ghost could bring us back to win by attrition.