I think it depends on the layer 2 solution, but as far as I understand, each of these layer 2 solutions independently have 2000-4000 as theoretical max, and only after bulking transactions together do they affect layer 1, so you should be able to add all layer 2 together for the total.
I guess the spatial sharding update will further increase the maximum number of transactions you can bulk by a factor or two so an individual layer 2 solution becomes comparable with visa, but I don’t think that update is coming to Ethereum in several years. Then again, Ethereum needing to perform 60,000 TPS is likely not happening this decade either.
For now at least, layer 2 is fast and cheap, although a bit difficult to use.