English Translation
He’s writing a book now.
Is 今本 genuinely one lexical item pronounced いまもと, or is it just the two common words 今 いま + 本 ほん?
Try Google Translate’s TTS by replacing 今本を書いています with 今、本を書いています. (insert 、after 今).
We don’t usually drop 、in this sentence structure unless it’s post on social media in order to minimize characters.