A game of LoL takes about 30 to 45 minutes. When you are unfamiliar with the game, it can be frustrating not knowing if your child's game is going well or not. To help you, I am going to give you 4 very simple indicators that you will have to observe.
First of all, you should already identify the colour of your child's team, blue team on the left and red team on the right.
Kills number : if a team has the highest number of kills, that's a good sign for it. In the example below, the blue team is ahead of the red team by 13 kills, which is a huge advantage.
Gold : The team with the most gold is doing well. Here, the blue team is more than 10K gold ahead.
The number of towers destroyed : The more towers destroyed the better! The blue team has destroyed 11 towers (this is the maximum).
Drakes number : The more drakes a team has, the stronger it will be. If a team gets 4 drakes, it will get an extra upgrade. Here each team has 3 drakes.