[7][8] He was the first bowler for Essex to take nine wickets in an innings since Mark Ilott in 1995, and he finished with career-best match figures of 14 for 172.

[10]In October 2018, Harmer was named in Jozi Stars' squad for the first edition of the Mzansi Super League T20 tournament.

[13] In September 2019, he was named in the squad for the Jozi Stars team for the 2019 Mzansi Super League tournament.

[15] In 2019 Harmer expressed a desire to play for the England national team, but due to a variety of immigration regulation changes in the wake of Brexit in 2020, this proved impossible and he abandoned the idea in 2021.

[16] In April 2021, Harmer was named in Northerns' squad, ahead of the 2021–22 cricket season in South Africa.