How do I know if my email has been delivered in Gmail?

Gmail has an option to email read receipt with the help of gmail read receipt. You can easily know if emails have been delivered in Gmail or not. But you have to request to activate it with the help of gmail read receipt settings.In case your request read receipt gmail not showing then you have to follow this steps:

Login your gmail account

Then Go to Apps>>Google workspace>> Gmail

Again click on Email read receipts

And then click on save option.