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When the user has finished updating/selecting items for purchase, I've seen buttons like $4.99 – Proceed to checkout on the product list page. Specifically, GrabFood uses this when you try to update your selected menu item with additional toppings/items.
Is there any benefit or drawback to putting the price on the proceed to checkout button itself?
Users care about their money. Any mistake (for example, paying more than expected) will be very painful.
You should care about what your users care, so help them avoid mistakes.
When you put the price somewhere in the checkout form, users can easily ignore it, especially if they're in a rush.
If you put the sum on the checkout button, it serves as a kind of confirmation: the hope is, users will scan the label before clicking on it, so if it's not what they expect, they might not click it.
Of course, it's no guarantee, but it is a double confirmation tool for a cost of making the label a little longer.
It also helps ease anxiety for people not used to paying online - double confirmations help them make sure they are on the right track.
