On December 15th I compared COVID positive cases from this season to last in the EPL (here). While the positivity data does not control for the frequency of testing (and note that the dates do not map perfectly by game week, as last season began later), we saw a similar December increase. It took until mid/late January to get control of this last season.
The most recent data would suggest that the wave has passed for 21/22 (see series of weekly positive numbers below). Although the number of positive cases was still greater than last winter – perhaps partly due to additional testing capacity – the clubs seem to have got a hold on the virus.
I would expect the positivity rate to fall further as we enter the final third of the season. The implication being almost no fixtures should be postponed going forward. Note, it is my understanding that these data are for all staff at clubs, not just players.