I remember I saw an article saying Turkey extended the deal from 35 to 160 aircrafts but not confirmed. It seems we signed the deal. I hope the process does not cease due to the ordinary nonsenses of US. Maybe our ability to produce kits locally might have pushed the US to endorse such a deal.Block 40s and block 50s will be modernized after block 30s. The modernization process will continue for a decade. Block 30s are the oldest one so they will go under modernization first. There are around ~140 block 30 and 40 aircraft with a tempo of 2 per month it will take ~6 years to modernize block 30s and 40s. The modernization process of block 30 and 40s will be finished around 2028-29(2022/23 to 2028/29). The first modernized F-16 block 30s will be retired between 2040-2045 while the last modernized ones might see 2060.
Tusas is getting structural upgrade kits from LM because you can't breach license agreements and produce every part independently. That doesn't mean Tusas can't produce the structural parts it gets from LM if it comes to that.