We don't know anything specific yet, but we can surely speculate.
First off, the landing thrust will be much lower than the launch thrust, as instead of whole stack filled to the brim with fuel, we'll have the booster and the starship landing separately and almost empty. Starship was landing just fine on its 3 atmospheric engines on concrete, the empty superheavy likely of similar mass (while it's bigger and heavier on launch, more of its mass is in fuel), and so the only worry might be some damage to the deluge system plates (which, without the water protecting them, are somewhat more fragile than a flat concrete landing pad) - plus potentially secondary damage to the booster/starship with torn off plates and debris if it goes very badly.
As result, I believe to offset this the deluge system will be activated but at much lower pressure/flow than during launch - much less heat and force to dissipate, no need for that much water, and reducing risk of problems of pumping the full blast of water into throttled and inactive engines, which could damage them.
At this point though, it's too early to say anything for sure - we'll certainly know more after the first successful capture of SuperHeavy.