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I just checked, and we haven't added a leap second this year, and one is not currently scheduled as far as I can determine. They normally announce them several months in advance. As such, I really doubt there has been any substantial slowing of the earth's rotation. The last leap second was added in 2016.

The following table shows the leap seconds added each year since 1972. They are added in June or December. If one was to be added this year, we'd have heard about it by now.

Announced leap seconds to date
Year	Jun 30	Dec 31	Total
1972	+1	+1	2
1973	0	+1	3
1974	0	+1	4
1975	0	+1	5
1976	0	+1	6
1977	0	+1	7
1978	0	+1	8
1979	0	+1	9
1980	0	0	9
1981	+1	0	10
1982	+1	0	11
1983	+1	0	12
1984	0	0	12
1985	+1	0	13
1986	0	0	13
1987	0	+1	14
1988	0	0	14
1989	0	+1	15
1990	0	+1	16
1991	0	0	16
1992	+1	0	17
1993	+1	0	18
1994	+1	0	19
1995	0	+1	20
1996	0	0	20
1997	+1	0	21
1998	0	+1	22
1999	0	0	22
2000	0	0	22
2001	0	0	22
2002	0	0	22
2003	0	0	22
2004	0	0	22
2005	0	+1	23
2006	0	0	23
2007	0	0	23
2008	0	+1	24
2009	0	0	24
2010	0	0	24
2011	0	0	24
2012	+1	0	25
2013	0	0	25
2014	0	0	25
2015	+1	0	26
2016	0	+1	27
Year	Jun 30	Dec 31	Total
Total	11	16	27
Current TAI-UTC = 37