Keeping pancakes warm without getting soggy is sometimes a challenge so it's best to make the pancakes as close to serving time as possible.
However the way I've found to keep my pancakes warm without them becoming soggy is to take a pan and put it on the rack in a 200-degree oven and place your pancakes on the rack in a single layer, uncovered, for up to 20 minutes.
The warm oven will keep the pancakes hot enough to melt butter, and leaving the pancakes uncovered keeps them from becoming soggy.
Don't leave the pancakes in the oven longer than 20 minutes otherwise they'll dry out.