You have a TV show that you always love to watch on Thursday nights. Your husband wants to watch a DVD on the TV, but you don't want to miss the show that you always watch. You want him to watch the DVD on his computer instead, so you say:
My show is coming on at ten.
(something) is (happening)
When you describe what's happening right now, you say "something is happening":
My wife is washing the dishes.
You can also use the same type of sentence to describe things that are going to happen in the future. But it has to be something that is already decided and scheduled. In the example above, there is a set schedule for the show. In the following example, the speaker has already found out whether the people he invited are coming to a party:
About fifteen or twenty people are coming.
Even though the speaker doesn't know the exact number, the people who are coming have already decided and he has already confirmed that they are planning to attend.
In situations where the future hasn't been decided yet, you use "is going to (happen)":
I think it's going to rain tomorrow.
come on at (time)
The phrase "come on" is used to describe a show airing on TV. If you want to tell what time the show starts, you say it "comes on at ___". The phrase "come on" only describes the beginning of the show. If you want to describe the entire length of the show, use "be on":
My show is on from ten to eleven.
ten
In casual speech, people often just say "ten" instead of "ten o'clock" when naming a time.
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