I haven't engaged with Dr John Yam myself, but a friend of mine went to TMC and her gynae fees were quite steep lah, so you'll probably want to call TMC directly or his clinic to ask for the exact quote since it can vary depending on whether you're doing normal delivery or Caesar and what package you choose. TMC private rates are definitely on the pricier side compared to KKH or other hospitals, so it's good you're checking upfront before committing.
I didn’t personally use Dr John Yam, but I’ve seen a few mummies mention him before in TMC groups 😊 Fees can really vary depending on natural birth vs C-section and your ward type though. Maybe you can call the clinic directly to check the estimated package price, they’re usually quite helpful!