They've been available for over a year. I started doing this earlier in the year. Couldn't be happier.
Just so you know, I don't see visa / mastercard going anywhere. Until you can use bitcoin using the same paywave tech that credit cards use, the over-the-counter use case of bitcoin will not be realized. The alternative is just too easy. But with a bitcoin debit card, you get the best of both worlds. My money isn't being debased while it sits in my wallet, and I have the freedom to use it when I want.
I think it will be several years before the layer-2 tech of bitcoin like lightning allows that type of functionality. The existing system is just too effective. I think it is more likely that lightning will be bootstrapped through organic growth like paying your local dealer than it will be by paying for your groceries.