Lately = مُؤَخَّرًا / في الفَتْرَة الأَخيرَة
Lately you can speak English better than she does
أنت تتَكَلَّمُ الاِنْجليزِيَّة أَحْسَنَ مِنْها مُؤَخَّرًا
Her cooking is getting better lately
طَبْخُها تَحَسَّنَ مُؤَخَّرًا
Lately I've been concerned about my divorced female friend
مُؤَخَّرًا أَصْبَحْتُ قَلِقًا حَوْلَ صَديقَتي المُطَلَّقَة