103 days from seed is a meaningless metric, as the only thing that matters, is how many days since you've changed your light schedule to 12/12.
If its 103 days old, but only 45 of those days were in flower, you likely still have several weeks.
From the looks of it, you do in fact need to wait a few more weeks, as buds dont look like theyve swollen, pistils are still white, and I'd assume if you looked under magnification, that your thrichomes are still completely clear as well.
When in doubt, add 2 weeks. And also, no need to flush.. flushing is anecdotal, and theres in fact evidence that it does nothing at all. You can ease back on nutrients, or stop them completely when your getting a bit closer... but no need to do a full flush on them