Ranking a new posts or other content in google search can take anywhere from 90 days to 180 days.
When you post blog content you have to be patient and wait it out.
You won't get instant search traffic after you hit the submit post button.
I know some websites can rank a new article in google within 30 minutes and be on the first page but that's rare and most likely there website has been online for a decade or more and already has a lot of website traffic to it.
If an seo company tells you they can rank you overnight and your website is new then they're lying.
No one can guarantee the first page of google search results.
Expect to wait 90 to 180 days which translates to 3 to 6 months before showing up on the first page of google.