Extending a query with calculated value

I have a log table something like the example below. I have a query which will group by FK and colB to show the most recent entry for each fruit per FK. This query is listed below. I would like to extend this query if possible to calculate the time difference between the current max value I'm bringing back and the most recent entry for the respective grouping where the progress = 1/10. I can split the progress column into two separate columns if need be, but I'm not sure what I'm trying to achieve here is even possible. any pointers?

--My Table
FK|colA|colB|progress|timestamp
2|y|apple|2/10|2023-03-03 09:43:20
1|c|orange|3/10|2023-03-03 09:42:00
1|b|orange|2/10|2023-03-03 09:41:00
2|x|pineapple|1/10|2023-03-03 09:40:40
2|z|apple|1/10|2023-03-03 09:40:35
1|a|orange|1/10|2023-03-03 09:40:00
1|c|orange|3/10|2023-02-03 11:02:00
1|b|orange|2/10|2023-02-03 10:41:00
1|a|orange|1/10|2023-02-03 10:30:00

--Current Query
SELECT l.*
FROM log l,
(SELECT FK, ColB, MAX(TIMESTAMP) AS Timestamp
FROM log
GROUP BY FK, ColB DESC
ORDER BY TIMESTAMP DESC) l1
where l.FK=l1.FK
             AND l.Timestamp=l1.Timestamp
             AND l.colB=l1.colB
ORDER BY l.FK, l.Timestamp DESC;

--Current Output
FK|colA|colB|progress|timestamp
1|c|orange|3/10|2023-03-03 09:42:00
2|x|pineapple|1/10|2023-03-03 09:40:40
2|y|apple|2/10|2023-03-03 09:43:20

--Desired Output
FK|colA|colB|progress|timestamp|Timetaken(HH:MM:SS)
1|c|orange|3/10|2023-03-03 09:42:00|00:02:00 (2023-03-03 09:42:00 - 2023-03-03 09:40:00)
2|x|pineapple|1/10|2023-03-03 09:40:40|00:00:00 (2023-03-03 09:40:40 - 2023-03-03 09:40:40)
2|y|apple|2/10|2023-03-03 09:43:20|00:02:45 (2023-03-03 09:43:20 - 2023-03-03 09:40:35)

If you are using MySQL 8, you can use LEAD() to get your next line to compare:

Something like that :

SELECT 
K, 
ColB, 
MAX(TIMESTAMP) AS Timestamp,
LEAD(MAX(TIMESTAMP)) OVER w,
TIMEDIFF(LEAD(MAX(TIMESTAMP)) OVER w, MAX(TIMESTAMP)) as compare
FROM log
GROUP BY FK, ColB DESC
WINDOW w as (ORDER by TIMESTAMP)
ORDER BY TIMESTAMP DESC;

Results with my data without K and ColB :

2020-01-28 14:25:00	2020-01-28 14:30:00	00:05:00
2020-01-28 14:30:00	2020-01-28 14:45:00	00:15:00
2020-01-28 14:45:00	2020-01-28 14:47:00	00:02:00
2020-01-28 14:47:00	2020-01-28 15:00:00	00:13:00
2020-01-28 15:00:00	2020-01-28 15:00:00	00:00:00
2020-01-28 15:00:00	2020-01-28 15:06:00	00:06:00
2020-01-28 15:06:00	2020-01-28 15:30:00	00:24:00
2020-01-28 15:30:00	2020-01-28 15:34:00	00:04:00
2020-01-28 15:34:00	2020-01-28 16:15:00	00:41:00
2020-01-28 16:15:00	2020-01-29 07:57:00	15:42:00
2020-01-29 07:57:00	2020-01-29 07:57:00	00:00:00
2020-01-29 07:57:00	2020-01-29 08:00:00	00:03:00