Hi, @yohan2on, please check your steempress plugin setting. How long the delay time set there?
If you want the post appears directly at the same time as your wordpress post, make it 0 for the delay time.
I don't think that posting it manually on steemit after the post published on your wordpress as a safe action. Cheetah will notice it as copy paste (plagiarism).
Steempress function is as plugin to connect your post from wordpress to steemit, so if you do it by your self manually, then why should you use steempress? 😊