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I'm home!; I'm back!; it's me!
now; at present; at the moment
just now; a moment ago
at once; right away; in a minute; shortly; soon
玄関を開けてただ今と声をかけた。
I opened the door and called out 'I'm home.'
ただ今戻りましたと上司に報告した。
I reported to my boss that I had just returned.
子供たちがただ今と元気に帰ってきた。
The children came home cheerfully saying 'I'm back.'