This was the picture at the end of May but it will have changed even since then, as polling data appears to show that the Tories have dropped another couple of points since then.
To be clear, I don't intend to twist this as "good news" for Labour, not least because it's bad politics to do nothing and rely on your opponents to collapse. Any successful Labour campaign will need to do more than "look at how badly things have gone". On the other hand I don't agree that in 4.5 years we'll necessarily have forgotten about this. A nightmare scenario is that Covid-19 keeps changing just enough to always be around, for example; and it will take plenty of time to escape the unprecedented economic damage of the last few months.