Progress Calendar in SwiftUI

I'm building a progress calendar feature in my app. There is a progress bar in my app, if the user reaches 100% at the current day, I want to show them a checkmark in the calendar so they can see in which days they completed their goal. What would be the way to build it? I guess I can have a variable for each day of the month and make it true if the user reaches 100% for that day, but that seems like a really bad solution.
Here is my calendar usage.

Code Block CalendarView(interval: year) { date in
                                if calendar.component(.day, from: date) == calendarCurrent.component(.day, from: currentDate) {
                                    ZStack {
                                        Text("30")
                                            .hidden()
                                            .padding(8)
                                            .overlay(
                                                RoundedRectangle(cornerRadius: 10,
                                                                 style: .continuous)
                                                    .stroke(Color(red: 50/255, green: 104/255, blue: 144/255), style: StrokeStyle(lineWidth: 2)))
                                            
                                            .padding(.vertical, 4)
                                            .overlay(
                                                Text(String(self.calendar.component(.day, from: date))).bold())
                                            .foregroundColor(.white)
                                        
                                        
                                    }
                                } else {
                                    ZStack {
                                        Text("30")
                                            .hidden()
                                            .padding(8)
                                            .background(Color(red: 50/255, green: 104/255, blue: 144/255))
                                            .clipShape(RoundedRectangle(cornerRadius: 10))
                                            .padding(.vertical, 4)
                                            .overlay(
                                                Text(String(self.calendar.component(.day, from: date))).bold())
                                            .foregroundColor(.white)
                                    }
                                }
                            }