Answer: No, Do you know which varieties you planted? Each type of potato has different “days to maturity”. For example, Mnandi cultivar are 90 to 110 days to maturity.
Flowering just means that the vines are mature enough and have enough leaf area to start forming tubers. It doesn’t mean the tubers are ready to harvest.
If you can’t remember or don’t know when you’ve planted, grub around the soil below the vines with your hands periodically to feel for tuber development.