what i would personally do, based on my past experience with osta in pct, is wait until 4 weeks after pct and run it as a bridge. While it may or may not effect recovery, when post pct bloodwork comes in, i'd rather know the results were not possibly skewed by anything. I've seen accounts where people have recovered fine with osta in pct and seen accounts where they did not. Whether the osta was to blame or not is anyone's guess.
I also noticed the amount of suppression cause by osta varied depending on what company I used. I've tried a few different distributors, and The one with the least suppression, and the best results was SarmsSearch. I used to preach on here that there's no way a price difference THAT great is justifiable. It really is though.
If you're still thinking about jumping on sarms, do it post pct. and give SS a try. They're having a discount right now 30% off everything. Use the discount code SIZZLE30.