This is really dependent on how much strength you have to start with.
I’m still not doing inverts and I’ve been dancing for 18 months.
Some students can invert within a month of learning, but they’re usually ex-circus or serious martial artists.
Some, like me, are taking their time to invert and doing it at their own pace.
Take your own time to get the move, do not compare yourself to anybody else for progress.
Doing pressups will help, along with Veena’s videos for strength.
Chris from X-Pole does 50+ pressups per day for upper body strength. But he’s a boy!!
Also ensure you engage your shoulders, as this will strengthen your lats and other big back / shoulder muscles.
Veena has a video on this and my GP (who has a Masters in Sports medicine) completely agrees with this as it prevents tight shoulder capsules, rotator cuff injuries and Impingements. All hurt and prevent poling.
Hope this helps