Theres a heck of a lot of catch up work to do..
Not really. United Kingdom has about 400,000 miles of roads. A driver and co-pilot can easily to 20,000 miles a year. That's 20 full time employees for a year.
If you think that's a long time, consider that all the street photos that Google has today are one year old and often very outdated when that year is over, so Google has to do exactly the same work.
No. When Apple scraps it's terrible mapping initiative that will never catch up and gives users control of mapping API providers that will be a cause for celebration. That they're going to make a 10% working solution 12% working is a cause for abject misery because it means they're throwing away more resource on a failed project.
In the United Kingdom, I'd say that Apple Maps is doing quite well compared to Google Maps. Each one is ahead in some areas, so for planning a recent holiday in an area that I don't know at all I used both side by side, but Apple Maps was certainly ahead in some areas.
Apart from that, the locations that you read about in the UK were the ones planned for July. I'm sure they will go to different places in August, and in September, and so on, and Google must make the exact same investment not to fall behind. You know, maps are not just a matter of "catching up". Maps are an area where you can lose the lead very quickly, and Google has already done that in some areas.