You can do this at any stage of the 2022/23 season, but this will see the odds change a lot. You may see one side as the big favorites in the EPL title betting market before a ball is kicked, but they then lose five games in a row. This would see their odds drift. Similarly, if a side wins their first 10 games in a row and opens up a 10-point lead at the top, their EPL winner odds will shorten.
Timing your bet on the league winner is vital as the odds on each team will shift so much as the season wears on.