Yes, you can read Bhaktamar at 4 pm today.

In Jain tradition, Bhaktamar Stotra can be recited at any time of the day with:

• Shuddh bhav (pure feelings)
• Respect for Bhagwan
• Cleanliness of body and place as far as possible
• Shant (peaceful) mind and voice

Some people prefer morning time (especially after snan and before food) because the mind is fresher and it becomes a daily niyam, but it is not a strict rule that you cannot recite it in the afternoon or evening.

So, if 4 pm is convenient for you, you can definitely read Bhaktamar then.