Smallish bowl of dried food available for ad lib "grazing".
Wet food served up twice a day, usually 7.30 am and 6 pm. Usually a pouch between them, but if they clean up, then may be given more.
Oliver Sprout is a big chap, (just a tad under 6 kilos [shock ]) but definitely not obese, Minnie in comparison is quite a dainty little thing at around 3 kilos.
I'm afraid that I just put the food down and let them get on with it.
I really cannot stand over them and make sure each one gets the right amount of food for their size!
When we got Minnie from Cat's Protection, the fosterer was worried that with the ad lib dried food she would just pig out and get fat. She had been a stray, and while with CP would clear her bowl every time food was offered.
I think that now she does actually know where her next meal is coming from, she isn't quite such as greedy gut bucket as she was! 
Both happy and healthy, although Oliver Sprout is (as I believe I have mentioned on a previous thread) an incredibly messy eater.