Hi
Page Speed Insights the Instagram article is slower on AMP (mobile) than on Mobile version.
Page speed insight cannot be used on AMP pages, it does not take into account the fact that pages are cached.
Page Speed Insights the Instagram article is slower on AMP (mobile) than on Mobile version.
This might be the case but it does not matter with AMP as the pages are cached by Google and Bing and displayed instantly.
Then I used "Delay" and this is my mistake (by analogy) because of the term "late", my bad
"The scheduled event, check_plugin_updates-weeblramp/weeblramp.php, is late to run"
So there's no relationship between this and the fact the Page Speed may find your page slower. The check_plugin_updates is something that happens once on a while, not when rendering pages. It will actually happen and be triggered by any page on your site, AMP or not.
The only reason a cron job could be late is if there's not enough visits on the site to trigger it before the date and time it was scheduled. This does not denote an issue with the plugin itself, only that your crons are not running often enough.
Note that the fact you only see weeblrAMP listed there only means that you probably don't have many scheduled tasks on your site.
A definitive fix is indeed to have a real CRON set up. As this will be triggered by your server, I suspect your hosting company can help. If you ask them assistance in setting up a "cron for WordPress", I'd suspect they'll be very familiar with that.
Lastly, this message will not affect weeblrAMP operation in any way.
Best regards