www.wysiwygwebbuilder.com

Is it possible to schedule the publication time of my site.
I need to publish some update at a certain time.

There is no built-in option for this, so you will need an third party upload tool for this.

If it is a page or two you can turn off publishing for the pages, and turn it back on when you are ready to publish.

What third party software do you recommend?
Thank you

Any FTP tool will work, but this may be useful:
https://www.smartftp.com/en-us/client/features/schedule

The price is a huge thing with your suggestion Pablo, the Scheduler feature requires the Enterprise version, priced at 359.95 USD or 179.99 USD per year.