I see a lot of people at least joking about going vegan lately. I've been vegan for roughly.... ah, I want to say 4 years now? I lost track awhile ago. It was around the time the wreckers came to Hexbear and convinced a bunch of us to watch Dominion (highly recommend doing so btw, it's free online).
ANYWAYS, if you're interested in more than just shitposts and are seriously interested in veganism I was thinking I could help answer any questions you have. Comment here or send me a DM if you're blush shy. 
This comm has limits on what we can talk about btw, such as diet. And I think the whole website has restrictions on recommending specific brands of food? So DM for questions like that, thanks.
On average, how much time do you take a week to do food prep at home (hours)?
Related question - what are your favorite/recommended "grab and go" vegan foods?
I can answer the first question here, second question I'll generalize here and DM you specifics.
So I'm assuming food prep includes weekly cooking. My partner and I don't like to do all our cooking at once. Let's see... we'll typically eat something easy for breakfast like fruit or instant grits/oatmeal, lunch is either leftovers or frozen meals, but dinner usually involves cooking. We cook dinners for 5-6 days of the week. Sometimes it's an easy 20 minute salad and other times it's a 1.5 hour chili or daal that we let simmer for a while. On the average week, I'd say we cook a combined 5-6 hours. Less if we eat out more or there's a great frozen food sale, more if we're trying to eat more veggies and whole foods.
As for grab and go, there's a ton of options. If you're at the grocery store, there are usually lots of vegan frozen meals and vegan chicken nuggets/tenders to pick from. (Never get vegan wings, though, they're expensive and taste like shit.) Other nice things include samosas, frozen pizza, instant ramen, ice cream pints, sorbet, veggie fried rice, a surprising amount of chips, pretzels, cookies, some chocolate bars and even fake meat/cheese deli options at one grocery store I frequent. They can make whole fresh vegan subs nowadays, and it's not just filled with vegetables like at a certain sub chain.
If by grab and go you meant eating out, there are lots of options as well. I'm going to assume you live in an area that doesn't have a ton of vegan restaurants, so this list will be a little generic: smoothies, vegetable subs, veggie/tofu sushi, pad thai, tons of Mexican food (ask if the beans are vegetarian-they can be fried in animal fat), fake protein burgers (fake meat/black bean/veggie/ect), most fries, most hashbrowns, avocado toast, most coffee places have vegan options, acai bowls, and so much more depending on your location. There are entire guides to eating out vegan, since plenty of us have to travel eventually.
Long story short, cooking is great and recommended, but you absolutely do not need to know how to cook to be vegan. Eat as little or as much slop as you want, I certainly do.