You'll likely be fine, most of the conversion is done in the first 15-20 min so your temp at point was likeyl still close to 148. It may just finish close to 1.000 or go lower and seem a little thin or watery, but 3711 will give it a little fuller mouthfeel.
As for the yeast/nutrient pack nothing hurt there, you just have the yeast a little extra food, not that 3711 really needs it
I normally see activity within a few hours with most Saison strains, but I wouldn't worry too much. Are you just not seeing airlock bubbles? Many will tell you and there's proof to it that airlock activity does price/disprove fermentation activity.
As for the yeast/nutrient pack nothing hurt there, you just have the yeast a little extra food, not that 3711 really needs it
I normally see activity within a few hours with most Saison strains, but I wouldn't worry too much. Are you just not seeing airlock bubbles? Many will tell you and there's proof to it that airlock activity does price/disprove fermentation activity.