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APY depends on the current validator count, decreasing as more validators come online. Currently, the base APY is around 4 %.

On top of that, you have to factor in luck: block proposals are randomly assigned to validators, and they include a random amount of tips depending on network activity. You could propose a block that nets you 0.01 ETH in tips, or a block with 50 ETH in tips.

On average, I believe the post-Merge APY has been estimated to be ≈6 % (non-cumulative).

Hardware can be anything. Even a RasPi 4 with 8 GB of memory can be made to work. Any old x64 machine with two or more cores works. 16 GB of memory is recommended, as is a 2 TB SSD to minimize down-time. Storage requirements are likely to go down in the medium-term, as e.g. state expiry get implemented.

I’d recommend an Intel NUC. They use laptop CPUs, so electricity consumption is around 5–20 watts. For networking, you’ll need around 5 Mb/s up and down after the initial sync.