Patience is a virtue

Right, local job to TNR 4 toms who come visit one of the local cat fosterer's, Joan, who is looking after the Mum and 7 kittens. She has around about 6 cats of her own which come and go around the house, but there are 4 'visitors' she wants looked after as well. Spent 2 hours there today and no sign of anyone! 3 of the 4 are usually around in the morning, one is more a night visitors. Got a bit tricky when her own cats were about in the garden as the others were likely to stay away. We got her own cats indoors, 1 by one, but no lucky.