Should I cut off yellow leaves?

So, unless they don't pull of with a light tug. They're still viable.. So, just keep an eye on them as if the issue remains it'll just move to another set(s)

Unless they are completely yellow and looking almost dead, don't cut them off. Your plant is taking the goodness from those leaves to help grow the flowers. Removing the leaves too early means your plant won't have access to these pre made essential elements, meaning it will have to use energy to re make them from new, and that energy can be better utilized in flower growth. Just because those leaves are starting to look a bit ugly, it does not mean that they are useless!

Senescence is normal part of the plant life cycle, the plant has decided to reallocate nutrients from lesser-needed leaves at the late stage of the game, this is a sign of good biochemical process within the plant, each leaf you take prematurely is removing mobile nutrients that could be used elsewhere. She looks really good, just keep doing what your doing and enjoy the show.

Their should not be that much yellowing yet. might be a sign it needs more N. The plant will drop them when its ready. if you touch them lightly and they fall off its ok. if you need to pull it more the plant is still draining them of nutrients so just wait till its done.