help with food portions!

hi guys. we give our cat a bowl of dry food to pick at throughout the day but we want to start giving her wet food more consistently. she is a big girl, we adopted her at 4 years old and she was 17lbs. she’s lost a pound since being with us but overall maintained. should we just give half of a can of wet food per day? or one half in the morning, other half at night?

we also want to add things for gut, bone, and joint health. i know omega-3 oils are great for that while also helping their coat. do you have any recommendations?

thanks everyone:)