will be along

will be along

Is or will be on one's way; is or will be coming. Other modal verbs, such as "should" or "would," can be used instead of "will. John will be along soon. He just had to make another stop on the way home. I thought Janet would be along by now.
See also: will
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be along

Will come, will arrive, as in John said he'd be along in a few minutes, or The doctor's report will be along by the end of the week. This phrase always indicates a future event. [Colloquial; early 1800s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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