No. Turkey has not changed its clocks since 2016 and there is no seasonal adjustment of any kind. The country stays on UTC+3 in January and in July alike.
If you are comparing Turkey with a country that does use daylight saving, the gap between you will still change twice a year. That change comes entirely from your side.
Turkey had used summer time since the 1980s, moving to UTC+3 in spring and back to UTC+2 in autumn. In September 2016 the autumn change was cancelled and the arrangement was made permanent.
Because the country stayed on the summer setting rather than the winter one, mornings became darker rather than evenings. Istanbul's latest sunrise moved to about 08:25 in late December.
Any code, spreadsheet or table that models Turkey as following EU daylight saving rules will be an hour wrong from late October to late March. The safe approach is to use the IANA zone Europe/Istanbul and let the time zone database handle it, which is what the clocks on this site do.
It also means a fixed offset is safe for Turkey specifically: UTC+3 is correct on every date since 7 September 2016.
7 September 2016. The clocks did not go back that October and have not moved since.
There is no current plan to. The permanent UTC+3 arrangement has been in place for nearly a decade.
The difference changes only if your own country observes daylight saving. Turkey's own offset is constant.