Looking on the internet deeply has found these results:

how are you doing today is the most popular phrase on the web.

how are you going today 1399 results on the web	how are you doing today 1415,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
... another thread and are both daily posters needing buddies. I am also fasting today and am on my second week. How are you going today? ... used when you can't remember, or don't want to use someone's proper name. Morning squire, are we winning today? G'day squire, how are you going today? You know when you start to say one thing, but then think another thing, and it comes out as some weird combination of words? “How are you going today? He kept asking me, "How are you going today? What are you doing today?" You know, he'd ask me questions that didn't make me think of what had happened, ...	The checkout girl said, "How are you doing today?" How are you doing today, sir? How are you doing today, ma'am? How are you doing today, Hallelujah? And how are you doing today, Mr. Claypool? How are you doing today, Jack?

how are you going today

1399 results on the web

how are you doing today

1415,000 results on the web

More popular!

... another thread and are both daily posters needing buddies. I am also fasting today and am on my second week. How are you going today?
... used when you can't remember, or don't want to use someone's proper name. Morning squire, are we winning today? G'day squire, how are you going today?
You know when you start to say one thing, but then think another thing, and it comes out as some weird combination of words? “How are you going today?
He kept asking me, "How are you going today? What are you doing today?" You know, he'd ask me questions that didn't make me think of what had happened, ...