It hit seven figures yesterday as it also overtook fellow Polydor release The Fame by Lady GaGa to become the biggest-selling album of the year to date, according to OCC data.
Progress, which up until yesterday had sold 1.009m units domestically, has taken 24 days to reach 1m sales compared to its predecessor The Circus managing to reach the landmark in 19 days two years ago.
The first album by the band since 1995 to feature Robbie Williams, Progress debuted at number one last month with 518,601 sales, the highest opening tally for any album since Oasis's Be Here Now in 1997. It sold 208,219 and 176,881 units respectively the following two weeks and has already surpassed 100,000 this week as it heads to a fourth successive week at number one.
Although it has now been overtaken as 2010's biggest album, Lady GaGa's The Fame is also expected to reach 1m sales this year in the next few days, having by yesterday moved its tally up to 990,000. The album was 2009's second top seller, finishing behind Susan Boyle's I Dreamed A Dream with nearly 1.4m sales.