The part of the sentence "once you have checked" is correct and usable in written English.
You could use this phrase at the beginning of a sentence to ask someone to do something after they have completed a task. For example: "Once you have checked the report, please send it to me."
Once you have checked the V&V report for the observation, you should reprocess the data.
Once you have checked into your lodgings, you may be ready to check out some of the village's 13 galleries.
Once you have checked at least one box, you will see the options available to filter content accordingly, as well as additional filtering and sort options.
But only once you have checked into one of the 16 apartments in the hill-hugging granite pile, and taken in the view down through the narrow headlands does the beauty of the place become clear.
So once you have checked out the great barrier reef, take a trip inland (about 15 minutes from Port Douglas) for a tropical banquet beneath some of the oldest trees in the world and listen to the ancient fireside tales.
All you have to do to have several repositories is to specify the appropriate repository, using the CVSROOT environment variable, the '-d' option to CVS, or (once you have checked out a working directory) by simply allowing CVS to use the repository that was used to check out the working directory (see section The Repository).
Once you've checked these matters out, give your child the green light.
Once you've checked with Skreemr, just try Googling for the artist, title, and "mp3" – this usually works, esp.
Once you've checked out the Jetta Sportwagen TDI, ask if there's anything he might have forgotten.
Once you've checked that your deposit is protected, put in the work to make sure that you get it back when you move out.
It may well be that once you've checked your facts, your boss's behavior will look better than it did at first glance.
