"Coming along" describes the progress or development of something over time. It is often used to ask about work, plans, skills, or recovery. It can also mean someone is joining you or arriving to go with you.
The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett
In a big family the first child is kind of like the first pancake. If it's not perfect, that's okay, there are a lot more coming along. Antonin Scalia
I want to be able to look back and say, 'I've done everything I can, and I was successful.' I don't want to look back and say I should have done this or that. I'd like to change things for the younger generation of swimmers coming along. Michael Phelps
It'll be all right, my fine fellow," said the Otter. "I'm coming along with you, and I know every path blindfold; and if there's a head that needs to be punched, you can confidently rely upon me to punch it. Kenneth Grahame
Ultimately, progress in applications is not deterministic, but opportunistic, exploiting for new applications whatever new science and technology happen to be coming along. Herbert Kroemer
This next song is only dedicated to beautiful people here tonight. That means all of you. Thank you for coming along... and making this a great occasion. Freddie Mercury