Yes, it can be beneficial.
In this particular instance, one important factor would be how much longer you plan on running your cycle.
The use of Winstrol is also an effective method of controlling progesterone-induced gyno, as it is anti-progestagenic. An effective dose appears to be in the vicinity of 50mg eod (depot) or 30 to 35mg/day (tabs) although this dose may require increasing depending on the doses being employed in the stack.
Winstrol can also have a profound impact on levels of SHBG (sex hormone-binding globulin). This admittedly is characteristic of all anabolic/androgenic steroids, however its potency and form of administration make Winstrol particularly noteworthy in this regard. Since plasma binding proteins such as SHBG act to temporarily constrain steroid hormones from exerting activity, this effect would provide a greater percentage of free (unbound) steroid hormone in the body.
Best of Luck