someone talk me through checking keyword ranking in google?

Also make sure you're looking at the right country. Search Console defaults to all countries, so add a country filter if you only sell in one.

Don't trust a manual google search for this, results are personalised by location and history so you'll see a flattering number. Search Console > Performance > Search results, tick average position, then filter by query or page. That's an average across every search it showed up in, so it moves around a bit. If you need a daily exact position for a set list of terms, that's what rank trackers are for.