At home, you can check it via clamp meter. It will probably draw more than rated current in case of being overcharged. But it can be due to other factors as well.
One thing, once gas leaks, the ideal scenario is to evacuate the system, fix leaks, leak test and then do full gas charge by weight along with vacuuming and proper compressor oil quantity.
Topup is just temporary solution and will not last long and every topup introduces extra contaminants within AC system. They usually keep refilling their gas cylinders with just 2-5 minutes vacuum and the contamination levels within those cylinders is pretty high.