They'll be fine for good weather but terrible in the slop of winter.
On my modern bikes I always run a Magic Mary up front. Not the lightest but another world grip wise compared to any older style. I switched back to some Conti Mountain/X Kings for a while and they scared me to death! Same as the XC tyres on my XC MTB, fine for gentle stuff or dry riding but I hit the deck as soon as it got wet and muddy.
Out back I run a Schwalbe Hans Dampf on my HT, Nobby Nick on my FS. The Dampf used to be my go to but is actually quite draggy so I probably won't get another. Yet to try the Nobby for winter riding.
Plenty of 26" available.
https://www.merlincycles.com/mountain-bike-tyres-75332/?diameter=26-&brand=schwalbe