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Once they feel dry and hard, they are ready to be stored.

Plant seeds, whether for flowers or some other kind of plant, need to ripen on the plant before you pick them. As far as I know, there's no way to ripen seeds off the plant. This article has more information on saving seeds: https://www.gardeningknowhow.com/ornamental/flowers/fgen/harvesting-garden-seeds.htm

Yellowing leaves are a sign of watering issues. With temperatures as high as your receiving, I would say it is a lack of water.
Water more and make sure you are watering deep enough. You will need to water twice a day with temperatures above 85 degrees.

Here is a link with care information.

https://www.gardeningknowhow.com/ornamental/flowers/sweet-pea/care-of-sweet-peas.htm

Yellow leaves can happen for a number of reasons. If leaves turn yellow suddenly, as opposed to yellowing slowly over time, the #1 cause in too little moisture in the soil. Try watering more, or more often.

You may also find this article helpful:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

They do enjoy sunlight, but in high temps will need extra water to compensate for the inevitable heat stress. If they are healthy but not blooming, they likely do have too much nitrogen. Give them some phosphorus to balance them back out. Bone meal is a good source of phosphorus.

Here are links to help you.

https://www.gardeningknowhow.com/ornamental/flowers/sweet-pea/care-of-sweet-peas.htm
https://www.gardeningknowhow.com/edible/vegetables/hops/growing-hops-plants.htm
https://www.gardeningknowhow.com/edible/fruits/grapes/grape-vine-winter-care.htm