I assume you're asking on how to check whether the op has now been injected or not in Taquito, since that's what you tagged it with.
In Taquito, when you call a certain contract entrypoint, like so:
const op = await contract.methods.default().send();
You should then do what's called a 'confirmation':
That method basically confirms that your operation now has been injected properly.
If you want the results of your operation, you can also see them by outputting the operation results:
For more examples, you can definitely check out some that we wrote here: https://github.com/ecadlabs/taquito/tree/master/example