American Diabetes Association guidelines are under 180 1-2 hours after the first bite of a meal. American Association of Clinical Endocrinologist guidelines are under 140 2 hours after the first bite of a meal.
Under 140 can be quite difficult to achieve without dropping low within 4+ hours (when action of bolus insulin should be gone, depending on your body), but is not impossible. Basically, you need to figure out what you can achieve and be happy with and how much time, effort, and cash you want to invest in the process.
I'm a long-time PWD who is OK with 180 every once in a while--especially if I'm back in range by the next meal. Yes, damage does occur when levels are high, but it also matters how long they are high (and how severe the ups and downs). For me, smoothing out drastic swings has been more important for improved A1Cs than worrying too much about the ocassional high--but your mileage may vary
Keep in mind, both sets of guidelines are general to cover all people with diabetes--longtime type 1s on MDI, those on pumps, newbie type 2s, etc. That's a huge spectrum of people, years with diabetes, body weights, activity levels, insulin production, other types of gut hormone production or lack thereof, menstrual cycles, etc. So, individually, we each really need to establish, with the help of a health care pro, an individual target range.
The numbers can be a bit tricky if you start a meal already out of range. Some people correct until back in target, then bolus and eat. Others correct and bolus at the same time. Another number I look at is attempting to achieve an increase of no more than 40-50 mg/dl from a meal, no matter the starting blood glucose.
Best wishes. Glad pumping is going well for you.