depends on which MFS branch you are looking at.
I enquired in MFS Jurong Point with the principle Rachel. She told me toddler 18m the waiting time is about 2 years. They only have 10+ slots and have 70+ parents in the queue. Probably the worst you can find there. Other MFS i am not sure but my friend apply at blk671A and he had been on the waiting list since January. There are many other childcare centre in the area, you can try your luck there.